diff --git a/Demo/cgi/cgi1.py b/Demo/cgi/cgi1.py
index 9d25c7d..842fef2 100755
--- a/Demo/cgi/cgi1.py
+++ b/Demo/cgi/cgi1.py
@@ -8,7 +8,7 @@
 # If cgi0.sh works but cgi1.py doesn't, check the #! line and the file
 # permissions.  The docs for the cgi.py module have debugging tips.
 
-print "Content-type: text/html"
-print
-print "<h1>Hello world</h1>"
-print "<p>This is cgi1.py"
+print("Content-type: text/html")
+print()
+print("<h1>Hello world</h1>")
+print("<p>This is cgi1.py")
diff --git a/Demo/cgi/cgi2.py b/Demo/cgi/cgi2.py
index d956f65..239fb6b 100755
--- a/Demo/cgi/cgi2.py
+++ b/Demo/cgi/cgi2.py
@@ -8,15 +8,15 @@
 
 def main():
     form = cgi.FieldStorage()
-    print "Content-type: text/html"
-    print
+    print("Content-type: text/html")
+    print()
     if not form:
-        print "<h1>No Form Keys</h1>"
+        print("<h1>No Form Keys</h1>")
     else:
-        print "<h1>Form Keys</h1>"
-        for key in form.keys():
+        print("<h1>Form Keys</h1>")
+        for key in list(form.keys()):
             value = form[key].value
-            print "<p>", cgi.escape(key), ":", cgi.escape(value)
+            print("<p>", cgi.escape(key), ":", cgi.escape(value))
 
 if __name__ == "__main__":
     main()
diff --git a/Demo/cgi/wiki.py b/Demo/cgi/wiki.py
index 2f944d6..6b97113 100644
--- a/Demo/cgi/wiki.py
+++ b/Demo/cgi/wiki.py
@@ -5,8 +5,8 @@
 
 def main():
     form = cgi.FieldStorage()
-    print "Content-type: text/html"
-    print
+    print("Content-type: text/html")
+    print()
     cmd = form.getvalue("cmd", "view")
     page = form.getvalue("page", "FrontPage")
     wiki = WikiPage(page)
@@ -20,22 +20,22 @@
 
     def __init__(self, name):
         if not self.iswikiword(name):
-            raise ValueError, "page name is not a wiki word"
+            raise ValueError("page name is not a wiki word")
         self.name = name
         self.load()
 
     def cmd_view(self, form):
-        print "<h1>", escape(self.splitwikiword(self.name)), "</h1>"
-        print "<p>"
+        print("<h1>", escape(self.splitwikiword(self.name)), "</h1>")
+        print("<p>")
         for line in self.data.splitlines():
             line = line.rstrip()
             if not line:
-                print "<p>"
+                print("<p>")
             else:
-                print self.formatline(line)
-        print "<hr>"
-        print "<p>", self.mklink("edit", self.name, "Edit this page") + ";"
-        print self.mklink("view", "FrontPage", "go to front page") + "."
+                print(self.formatline(line))
+        print("<hr>")
+        print("<p>", self.mklink("edit", self.name, "Edit this page") + ";")
+        print(self.mklink("view", "FrontPage", "go to front page") + ".")
 
     def formatline(self, line):
         words = []
@@ -51,32 +51,32 @@
         return "".join(words)
 
     def cmd_edit(self, form, label="Change"):
-        print "<h1>", label, self.name, "</h1>"
-        print '<form method="POST" action="%s">' % self.scripturl
+        print("<h1>", label, self.name, "</h1>")
+        print('<form method="POST" action="%s">' % self.scripturl)
         s = '<textarea cols="70" rows="20" name="text">%s</textarea>'
-        print s % self.data
-        print '<input type="hidden" name="cmd" value="create">'
-        print '<input type="hidden" name="page" value="%s">' % self.name
-        print '<br>'
-        print '<input type="submit" value="%s Page">' % label
-        print "</form>"
+        print(s % self.data)
+        print('<input type="hidden" name="cmd" value="create">')
+        print('<input type="hidden" name="page" value="%s">' % self.name)
+        print('<br>')
+        print('<input type="submit" value="%s Page">' % label)
+        print("</form>")
 
     def cmd_create(self, form):
         self.data = form.getvalue("text", "").strip()
         error = self.store()
         if error:
-            print "<h1>I'm sorry.  That didn't work</h1>"
-            print "<p>An error occurred while attempting to write the file:"
-            print "<p>", escape(error)
+            print("<h1>I'm sorry.  That didn't work</h1>")
+            print("<p>An error occurred while attempting to write the file:")
+            print("<p>", escape(error))
         else:
             # Use a redirect directive, to avoid "reload page" problems
-            print "<head>"
+            print("<head>")
             s = '<meta http-equiv="refresh" content="1; URL=%s">'
-            print s % (self.scripturl + "?cmd=view&page=" + self.name)
-            print "<head>"
-            print "<h1>OK</h1>"
-            print "<p>If nothing happens, please click here:",
-            print self.mklink("view", self.name, self.name)
+            print(s % (self.scripturl + "?cmd=view&page=" + self.name))
+            print("<head>")
+            print("<h1>OK</h1>")
+            print("<p>If nothing happens, please click here:", end=' ')
+            print(self.mklink("view", self.name, self.name))
 
     def cmd_new(self, form):
         self.cmd_edit(form, label="Create")
diff --git a/Demo/classes/Complex.py b/Demo/classes/Complex.py
index 2019cdf..b6c4b10 100755
--- a/Demo/classes/Complex.py
+++ b/Demo/classes/Complex.py
@@ -114,7 +114,7 @@
         self.__dict__['im'] = _im
 
     def __setattr__(self, name, value):
-        raise TypeError, 'Complex numbers are immutable'
+        raise TypeError('Complex numbers are immutable')
 
     def __hash__(self):
         if not self.im:
@@ -144,17 +144,17 @@
 
     def __int__(self):
         if self.im:
-            raise ValueError, "can't convert Complex with nonzero im to int"
+            raise ValueError("can't convert Complex with nonzero im to int")
         return int(self.re)
 
     def __long__(self):
         if self.im:
-            raise ValueError, "can't convert Complex with nonzero im to long"
-        return long(self.re)
+            raise ValueError("can't convert Complex with nonzero im to long")
+        return int(self.re)
 
     def __float__(self):
         if self.im:
-            raise ValueError, "can't convert Complex with nonzero im to float"
+            raise ValueError("can't convert Complex with nonzero im to float")
         return float(self.re)
 
     def __cmp__(self, other):
@@ -199,7 +199,7 @@
     def __div__(self, other):
         other = ToComplex(other)
         d = float(other.re*other.re + other.im*other.im)
-        if not d: raise ZeroDivisionError, 'Complex division'
+        if not d: raise ZeroDivisionError('Complex division')
         return Complex((self.re*other.re + self.im*other.im) / d,
                        (self.im*other.re - self.re*other.im) / d)
 
@@ -209,10 +209,10 @@
 
     def __pow__(self, n, z=None):
         if z is not None:
-            raise TypeError, 'Complex does not support ternary pow()'
+            raise TypeError('Complex does not support ternary pow()')
         if IsComplex(n):
             if n.im:
-                if self.im: raise TypeError, 'Complex to the Complex power'
+                if self.im: raise TypeError('Complex to the Complex power')
                 else: return exp(math.log(self.re)*n)
             n = n.re
         r = pow(self.abs(), n)
@@ -229,21 +229,21 @@
 
 
 def checkop(expr, a, b, value, fuzz = 1e-6):
-    print '       ', a, 'and', b,
+    print('       ', a, 'and', b, end=' ')
     try:
         result = eval(expr)
     except:
         result = sys.exc_info()[0]
-    print '->', result
+    print('->', result)
     if isinstance(result, str) or isinstance(value, str):
         ok = (result == value)
     else:
         ok = abs(result - value) <= fuzz
     if not ok:
-        print '!!\t!!\t!! should be', value, 'diff', abs(result - value)
+        print('!!\t!!\t!! should be', value, 'diff', abs(result - value))
 
 def test():
-    print 'test constructors'
+    print('test constructors')
     constructor_test = (
         # "expect" is an array [re,im] "got" the Complex.
             ( (0,0), Complex() ),
@@ -260,9 +260,9 @@
     for t in constructor_test:
         cnt[0] += 1
         if ((t[0][0]!=t[1].re)or(t[0][1]!=t[1].im)):
-            print "        expected", t[0], "got", t[1]
+            print("        expected", t[0], "got", t[1])
             cnt[1] += 1
-    print "  ", cnt[1], "of", cnt[0], "tests failed"
+    print("  ", cnt[1], "of", cnt[0], "tests failed")
     # test operators
     testsuite = {
             'a+b': [
@@ -310,7 +310,7 @@
             ],
     }
     for expr in sorted(testsuite):
-        print expr + ':'
+        print(expr + ':')
         t = (expr,)
         for item in testsuite[expr]:
             checkop(*(t+item))
diff --git a/Demo/classes/Dates.py b/Demo/classes/Dates.py
index 6494b6a..afb0ff2 100755
--- a/Demo/classes/Dates.py
+++ b/Demo/classes/Dates.py
@@ -57,7 +57,7 @@
     dbm = dbm + dim
 del dbm, dim
 
-_INT_TYPES = type(1), type(1L)
+_INT_TYPES = type(1), type(1)
 
 def _is_leap(year):           # 1 if leap year, else 0
     if year % 4 != 0: return 0
@@ -68,7 +68,7 @@
     return 365 + _is_leap(year)
 
 def _days_before_year(year):  # number of days before year
-    return year*365L + (year+3)/4 - (year+99)/100 + (year+399)/400
+    return year*365 + (year+3)/4 - (year+99)/100 + (year+399)/400
 
 def _days_in_month(month, year):      # number of days in month of year
     if month == 2 and _is_leap(year): return 29
@@ -86,7 +86,7 @@
 
 def _num2date(n):             # return date with ordinal n
     if type(n) not in _INT_TYPES:
-        raise TypeError, 'argument must be integer: %r' % type(n)
+        raise TypeError('argument must be integer: %r' % type(n))
 
     ans = Date(1,1,1)   # arguments irrelevant; just getting a Date obj
     del ans.ord, ans.month, ans.day, ans.year # un-initialize it
@@ -120,17 +120,17 @@
 class Date:
     def __init__(self, month, day, year):
         if not 1 <= month <= 12:
-            raise ValueError, 'month must be in 1..12: %r' % (month,)
+            raise ValueError('month must be in 1..12: %r' % (month,))
         dim = _days_in_month(month, year)
         if not 1 <= day <= dim:
-            raise ValueError, 'day must be in 1..%r: %r' % (dim, day)
+            raise ValueError('day must be in 1..%r: %r' % (dim, day))
         self.month, self.day, self.year = month, day, year
         self.ord = _date2num(self)
 
     # don't allow setting existing attributes
     def __setattr__(self, name, value):
-        if self.__dict__.has_key(name):
-            raise AttributeError, 'read-only attribute ' + name
+        if name in self.__dict__:
+            raise AttributeError('read-only attribute ' + name)
         self.__dict__[name] = value
 
     def __cmp__(self, other):
@@ -151,7 +151,7 @@
     # Python 1.1 coerces neither int+date nor date+int
     def __add__(self, n):
         if type(n) not in _INT_TYPES:
-            raise TypeError, 'can\'t add %r to date' % type(n)
+            raise TypeError('can\'t add %r to date' % type(n))
         return _num2date(self.ord + n)
     __radd__ = __add__ # handle int+date
 
@@ -164,7 +164,7 @@
 
     # complain about int-date
     def __rsub__(self, other):
-        raise TypeError, 'Can\'t subtract date from integer'
+        raise TypeError('Can\'t subtract date from integer')
 
     def weekday(self):
         return _num2day(self.ord)
@@ -179,30 +179,30 @@
     a = Date(9,30,1913)
     b = Date(9,30,1914)
     if repr(a) != 'Tue 30 Sep 1913':
-        raise DateTestError, '__repr__ failure'
+        raise DateTestError('__repr__ failure')
     if (not a < b) or a == b or a > b or b != b:
-        raise DateTestError, '__cmp__ failure'
+        raise DateTestError('__cmp__ failure')
     if a+365 != b or 365+a != b:
-        raise DateTestError, '__add__ failure'
+        raise DateTestError('__add__ failure')
     if b-a != 365 or b-365 != a:
-        raise DateTestError, '__sub__ failure'
+        raise DateTestError('__sub__ failure')
     try:
         x = 1 - a
-        raise DateTestError, 'int-date should have failed'
+        raise DateTestError('int-date should have failed')
     except TypeError:
         pass
     try:
         x = a + b
-        raise DateTestError, 'date+date should have failed'
+        raise DateTestError('date+date should have failed')
     except TypeError:
         pass
     if a.weekday() != 'Tuesday':
-        raise DateTestError, 'weekday() failure'
+        raise DateTestError('weekday() failure')
     if max(a,b) is not b or min(a,b) is not a:
-        raise DateTestError, 'min/max failure'
+        raise DateTestError('min/max failure')
     d = {a-1:b, b:a+1}
     if d[b-366] != b or d[a+(b-a)] != Date(10,1,1913):
-        raise DateTestError, 'dictionary failure'
+        raise DateTestError('dictionary failure')
 
     # verify date<->number conversions for first and last days for
     # all years in firstyear .. lastyear
@@ -214,9 +214,9 @@
         lord = ford + _days_in_year(y) - 1
         fd, ld = Date(1,1,y), Date(12,31,y)
         if (fd.ord,ld.ord) != (ford,lord):
-            raise DateTestError, ('date->num failed', y)
+            raise DateTestError('date->num failed', y)
         fd, ld = _num2date(ford), _num2date(lord)
         if (1,1,y,12,31,y) != \
            (fd.month,fd.day,fd.year,ld.month,ld.day,ld.year):
-            raise DateTestError, ('num->date failed', y)
+            raise DateTestError('num->date failed', y)
         y = y + 1
diff --git a/Demo/classes/Dbm.py b/Demo/classes/Dbm.py
index 482806a..fd73571 100755
--- a/Demo/classes/Dbm.py
+++ b/Demo/classes/Dbm.py
@@ -12,7 +12,7 @@
 
     def __repr__(self):
         s = ''
-        for key in self.keys():
+        for key in list(self.keys()):
             t = repr(key) + ': ' + repr(self[key])
             if s: t = ', ' + t
             s = s + t
@@ -32,35 +32,35 @@
 
     def keys(self):
         res = []
-        for key in self.db.keys():
+        for key in list(self.db.keys()):
             res.append(eval(key))
         return res
 
     def has_key(self, key):
-        return self.db.has_key(repr(key))
+        return repr(key) in self.db
 
 
 def test():
-    d = Dbm('@dbm', 'rw', 0600)
-    print d
+    d = Dbm('@dbm', 'rw', 0o600)
+    print(d)
     while 1:
         try:
-            key = input('key: ')
-            if d.has_key(key):
+            key = eval(input('key: '))
+            if key in d:
                 value = d[key]
-                print 'currently:', value
-            value = input('value: ')
+                print('currently:', value)
+            value = eval(input('value: '))
             if value == None:
                 del d[key]
             else:
                 d[key] = value
         except KeyboardInterrupt:
-            print ''
-            print d
+            print('')
+            print(d)
         except EOFError:
-            print '[eof]'
+            print('[eof]')
             break
-    print d
+    print(d)
 
 
 test()
diff --git a/Demo/classes/Range.py b/Demo/classes/Range.py
index 3f1daae..0f84157 100755
--- a/Demo/classes/Range.py
+++ b/Demo/classes/Range.py
@@ -60,7 +60,7 @@
         if 0 <= i <= self.len:
             return self.start + self.step * i
         else:
-            raise IndexError, 'range[i] index out of range'
+            raise IndexError('range[i] index out of range')
 
 
 def test():
@@ -73,7 +73,7 @@
         raise Exception("error in implementation:\ncorrect   = %s"
                          "\nold-style = %s\ngenerator = %s" %
                          (correct_result, oldrange_result, genrange_result))
-    print "Timings for range(1000):"
+    print("Timings for range(1000):")
     t1 = time.time()
     for i in oldrange(1000):
         pass
@@ -84,9 +84,9 @@
     for i in __builtin__.range(1000):
         pass
     t4 = time.time()
-    print t2-t1, 'sec (old-style class)'
-    print t3-t2, 'sec (generator)'
-    print t4-t3, 'sec (built-in)'
+    print(t2-t1, 'sec (old-style class)')
+    print(t3-t2, 'sec (generator)')
+    print(t4-t3, 'sec (built-in)')
 
 
 if __name__ == '__main__':
diff --git a/Demo/classes/Rat.py b/Demo/classes/Rat.py
index 24670b6..8caf1c5 100755
--- a/Demo/classes/Rat.py
+++ b/Demo/classes/Rat.py
@@ -42,7 +42,7 @@
 
     def __init__(self, num, den = 1):
         if den == 0:
-            raise ZeroDivisionError, 'rat(x, 0)'
+            raise ZeroDivisionError('rat(x, 0)')
 
         # normalize
 
@@ -106,9 +106,9 @@
             return rat(a.__num * b.__den + b.__num * a.__den,
                        a.__den * b.__den)
         except OverflowError:
-            return rat(long(a.__num) * long(b.__den) +
-                       long(b.__num) * long(a.__den),
-                       long(a.__den) * long(b.__den))
+            return rat(int(a.__num) * int(b.__den) +
+                       int(b.__num) * int(a.__den),
+                       int(a.__den) * int(b.__den))
 
     def __radd__(b, a):
         return Rat(a) + b
@@ -119,9 +119,9 @@
             return rat(a.__num * b.__den - b.__num * a.__den,
                        a.__den * b.__den)
         except OverflowError:
-            return rat(long(a.__num) * long(b.__den) -
-                       long(b.__num) * long(a.__den),
-                       long(a.__den) * long(b.__den))
+            return rat(int(a.__num) * int(b.__den) -
+                       int(b.__num) * int(a.__den),
+                       int(a.__den) * int(b.__den))
 
     def __rsub__(b, a):
         return Rat(a) - b
@@ -131,8 +131,8 @@
         try:
             return rat(a.__num * b.__num, a.__den * b.__den)
         except OverflowError:
-            return rat(long(a.__num) * long(b.__num),
-                       long(a.__den) * long(b.__den))
+            return rat(int(a.__num) * int(b.__num),
+                       int(a.__den) * int(b.__den))
 
     def __rmul__(b, a):
         return Rat(a) * b
@@ -142,8 +142,8 @@
         try:
             return rat(a.__num * b.__den, a.__den * b.__num)
         except OverflowError:
-            return rat(long(a.__num) * long(b.__den),
-                       long(a.__den) * long(b.__num))
+            return rat(int(a.__num) * int(b.__den),
+                       int(a.__den) * int(b.__num))
 
     def __rdiv__(b, a):
         return Rat(a) / b
@@ -154,7 +154,7 @@
         try:
             div = int(div)
         except OverflowError:
-            div = long(div)
+            div = int(div)
         return a - b * div
 
     def __rmod__(b, a):
@@ -175,8 +175,8 @@
         try:
             return rat(a.__num ** b.__num, a.__den ** b.__num)
         except OverflowError:
-            return rat(long(a.__num) ** b.__num,
-                       long(a.__den) ** b.__num)
+            return rat(int(a.__num) ** b.__num,
+                       int(a.__den) ** b.__num)
 
     def __rpow__(b, a):
         return Rat(a) ** b
@@ -187,7 +187,7 @@
             return rat(-a.__num, a.__den)
         except OverflowError:
             # a.__num == sys.maxint
-            return rat(-long(a.__num), a.__den)
+            return rat(-int(a.__num), a.__den)
 
     # abs(a)
     def __abs__(a):
@@ -199,7 +199,7 @@
 
     # long(a)
     def __long__(a):
-        return long(a.__num) / long(a.__den)
+        return int(a.__num) / int(a.__den)
 
     # float(a)
     def __float__(a):
@@ -272,38 +272,38 @@
     (3+1.5j) 1.5j (2.25+2.25j) (1+1j) (1.18235814075+2.85446505899j) 1
     (3+3j) 0j 4.5j (1+0j) (-0.638110484918+0.705394566962j) 0
     '''
-    print rat(-1L, 1)
-    print rat(1, -1)
+    print(rat(-1, 1))
+    print(rat(1, -1))
     a = rat(1, 10)
-    print int(a), long(a), float(a), complex(a)
+    print(int(a), int(a), float(a), complex(a))
     b = rat(2, 5)
     l = [a+b, a-b, a*b, a/b]
-    print l
+    print(l)
     l.sort()
-    print l
-    print rat(0, 1)
-    print a+1
-    print a+1L
-    print a+1.0
+    print(l)
+    print(rat(0, 1))
+    print(a+1)
+    print(a+1)
+    print(a+1.0)
     try:
-        print rat(1, 0)
-        raise SystemError, 'should have been ZeroDivisionError'
+        print(rat(1, 0))
+        raise SystemError('should have been ZeroDivisionError')
     except ZeroDivisionError:
-        print 'OK'
-    print rat(2), rat(1.5), rat(3, 2), rat(1.5+1.5j), rat(31415926,10000000)
+        print('OK')
+    print(rat(2), rat(1.5), rat(3, 2), rat(1.5+1.5j), rat(31415926,10000000))
     list = [2, 1.5, rat(3,2), 1.5+1.5j]
     for i in list:
-        print i,
+        print(i, end=' ')
         if not isinstance(i, complex):
-            print int(i), float(i),
-        print complex(i)
-        print
+            print(int(i), float(i), end=' ')
+        print(complex(i))
+        print()
         for j in list:
-            print i + j, i - j, i * j, i / j, i ** j,
+            print(i + j, i - j, i * j, i / j, i ** j, end=' ')
             if not (isinstance(i, complex) or
                     isinstance(j, complex)):
-                print cmp(i, j)
-            print
+                print(cmp(i, j))
+            print()
 
 
 if __name__ == '__main__':
diff --git a/Demo/classes/Vec.py b/Demo/classes/Vec.py
index 56cb839..edb3147 100755
--- a/Demo/classes/Vec.py
+++ b/Demo/classes/Vec.py
@@ -27,17 +27,17 @@
 
     def __add__(self, other):
         # Element-wise addition
-        v = map(lambda x, y: x+y, self, other)
+        v = list(map(lambda x, y: x+y, self, other))
         return Vec().fromlist(v)
 
     def __sub__(self, other):
         # Element-wise subtraction
-        v = map(lambda x, y: x-y, self, other)
+        v = list(map(lambda x, y: x-y, self, other))
         return Vec().fromlist(v)
 
     def __mul__(self, scalar):
         # Multiply by scalar
-        v = map(lambda x: x*scalar, self.v)
+        v = [x*scalar for x in self.v]
         return Vec().fromlist(v)
 
 
@@ -45,10 +45,10 @@
 def test():
     a = vec(1, 2, 3)
     b = vec(3, 2, 1)
-    print a
-    print b
-    print a+b
-    print a-b
-    print a*3.0
+    print(a)
+    print(b)
+    print(a+b)
+    print(a-b)
+    print(a*3.0)
 
 test()
diff --git a/Demo/classes/bitvec.py b/Demo/classes/bitvec.py
index 934d33a..97921f2 100755
--- a/Demo/classes/bitvec.py
+++ b/Demo/classes/bitvec.py
@@ -11,14 +11,14 @@
 
 def _check_value(value):
     if type(value) != type(0) or not 0 <= value < 2:
-        raise error, 'bitvec() items must have int value 0 or 1'
+        raise error('bitvec() items must have int value 0 or 1')
 
 
 import math
 
 def _compute_len(param):
     mant, l = math.frexp(float(param))
-    bitmask = 1L << l
+    bitmask = 1 << l
     if bitmask <= param:
         raise 'FATAL', '(param, l) = %r' % ((param, l),)
     while l:
@@ -31,11 +31,11 @@
 
 def _check_key(len, key):
     if type(key) != type(0):
-        raise TypeError, 'sequence subscript not int'
+        raise TypeError('sequence subscript not int')
     if key < 0:
         key = key + len
     if not 0 <= key < len:
-        raise IndexError, 'list index out of range'
+        raise IndexError('list index out of range')
     return key
 
 def _check_slice(len, i, j):
@@ -49,15 +49,15 @@
 class BitVec:
 
     def __init__(self, *params):
-        self._data = 0L
+        self._data = 0
         self._len = 0
         if not len(params):
             pass
         elif len(params) == 1:
             param, = params
             if type(param) == type([]):
-                value = 0L
-                bit_mask = 1L
+                value = 0
+                bit_mask = 1
                 for item in param:
                     # strict check
                     #_check_value(item)
@@ -66,39 +66,38 @@
                     bit_mask = bit_mask << 1
                 self._data = value
                 self._len = len(param)
-            elif type(param) == type(0L):
+            elif type(param) == type(0):
                 if param < 0:
-                    raise error, 'bitvec() can\'t handle negative longs'
+                    raise error('bitvec() can\'t handle negative longs')
                 self._data = param
                 self._len = _compute_len(param)
             else:
-                raise error, 'bitvec() requires array or long parameter'
+                raise error('bitvec() requires array or long parameter')
         elif len(params) == 2:
             param, length = params
-            if type(param) == type(0L):
+            if type(param) == type(0):
                 if param < 0:
-                    raise error, \
-                      'can\'t handle negative longs'
+                    raise error('can\'t handle negative longs')
                 self._data = param
                 if type(length) != type(0):
-                    raise error, 'bitvec()\'s 2nd parameter must be int'
+                    raise error('bitvec()\'s 2nd parameter must be int')
                 computed_length = _compute_len(param)
                 if computed_length > length:
-                    print 'warning: bitvec() value is longer than the length indicates, truncating value'
+                    print('warning: bitvec() value is longer than the length indicates, truncating value')
                     self._data = self._data & \
-                              ((1L << length) - 1)
+                              ((1 << length) - 1)
                 self._len = length
             else:
-                raise error, 'bitvec() requires array or long parameter'
+                raise error('bitvec() requires array or long parameter')
         else:
-            raise error, 'bitvec() requires 0 -- 2 parameter(s)'
+            raise error('bitvec() requires 0 -- 2 parameter(s)')
 
 
     def append(self, item):
         #_check_value(item)
         #self[self._len:self._len] = [item]
         self[self._len:self._len] = \
-                  BitVec(long(not not item), 1)
+                  BitVec(int(not not item), 1)
 
 
     def count(self, value):
@@ -121,7 +120,7 @@
             data = (~self)._data
         index = 0
         if not data:
-            raise ValueError, 'list.index(x): x not in list'
+            raise ValueError('list.index(x): x not in list')
         while not (data & 1):
             data, index = data >> 1, index + 1
         return index
@@ -130,7 +129,7 @@
     def insert(self, index, item):
         #_check_value(item)
         #self[index:index] = [item]
-        self[index:index] = BitVec(long(not not item), 1)
+        self[index:index] = BitVec(int(not not item), 1)
 
 
     def remove(self, value):
@@ -140,7 +139,7 @@
     def reverse(self):
         #ouch, this one is expensive!
         #for i in self._len>>1: self[i], self[l-i] = self[l-i], self[i]
-        data, result = self._data, 0L
+        data, result = self._data, 0
         for i in range(self._len):
             if not data:
                 result = result << (self._len - i)
@@ -151,7 +150,7 @@
 
     def sort(self):
         c = self.count(1)
-        self._data = ((1L << c) - 1) << (self._len - c)
+        self._data = ((1 << c) - 1) << (self._len - c)
 
 
     def copy(self):
@@ -199,16 +198,16 @@
     def __getitem__(self, key):
         #rprt('%r.__getitem__(%r)\n' % (self, key))
         key = _check_key(self._len, key)
-        return self._data & (1L << key) != 0
+        return self._data & (1 << key) != 0
 
     def __setitem__(self, key, value):
         #rprt('%r.__setitem__(%r, %r)\n' % (self, key, value))
         key = _check_key(self._len, key)
         #_check_value(value)
         if value:
-            self._data = self._data | (1L << key)
+            self._data = self._data | (1 << key)
         else:
-            self._data = self._data & ~(1L << key)
+            self._data = self._data & ~(1 << key)
 
     def __delitem__(self, key):
         #rprt('%r.__delitem__(%r)\n' % (self, key))
@@ -221,7 +220,7 @@
         #rprt('%r.__getslice__(%r, %r)\n' % (self, i, j))
         i, j = _check_slice(self._len, i, j)
         if i >= j:
-            return BitVec(0L, 0)
+            return BitVec(0, 0)
         if i:
             ndata = self._data >> i
         else:
@@ -230,7 +229,7 @@
         if j != self._len:
             #we'll have to invent faster variants here
             #e.g. mod_2exp
-            ndata = ndata & ((1L << nlength) - 1)
+            ndata = ndata & ((1 << nlength) - 1)
         return BitVec(ndata, nlength)
 
     def __setslice__(self, i, j, sequence, *rest):
@@ -250,7 +249,7 @@
         #rprt('%r.__delslice__(%r, %r)\n' % (self, i, j))
         i, j = _check_slice(self._len, i, j)
         if i == 0 and j == self._len:
-            self._data, self._len = 0L, 0
+            self._data, self._len = 0, 0
         elif i < j:
             self._data = self[:i]._data | (self[j:]._data >> i)
             self._len = self._len - j + i
@@ -264,18 +263,18 @@
     def __mul__(self, multiplier):
         #rprt('%r.__mul__(%r)\n' % (self, multiplier))
         if type(multiplier) != type(0):
-            raise TypeError, 'sequence subscript not int'
+            raise TypeError('sequence subscript not int')
         if multiplier <= 0:
-            return BitVec(0L, 0)
+            return BitVec(0, 0)
         elif multiplier == 1:
             return self.copy()
         #handle special cases all 0 or all 1...
-        if self._data == 0L:
-            return BitVec(0L, self._len * multiplier)
-        elif (~self)._data == 0L:
-            return ~BitVec(0L, self._len * multiplier)
+        if self._data == 0:
+            return BitVec(0, self._len * multiplier)
+        elif (~self)._data == 0:
+            return ~BitVec(0, self._len * multiplier)
         #otherwise el cheapo again...
-        retval = BitVec(0L, 0)
+        retval = BitVec(0, 0)
         while multiplier:
             retval, multiplier = retval + self, multiplier - 1
         return retval
@@ -309,7 +308,7 @@
 
     def __invert__(self):
         #rprt('%r.__invert__()\n' % (self,))
-        return BitVec(~self._data & ((1L << self._len) - 1), \
+        return BitVec(~self._data & ((1 << self._len) - 1), \
                   self._len)
 
     def __coerce__(self, otherseq, *rest):
@@ -323,7 +322,7 @@
         return int(self._data)
 
     def __long__(self):
-        return long(self._data)
+        return int(self._data)
 
     def __float__(self):
         return float(self._data)
diff --git a/Demo/comparisons/regextest.py b/Demo/comparisons/regextest.py
index 1fab052..d2c534d 100755
--- a/Demo/comparisons/regextest.py
+++ b/Demo/comparisons/regextest.py
@@ -21,7 +21,7 @@
 import re
 
 def main():
-    pats = map(chomp, sys.stdin.readlines())
+    pats = list(map(chomp, sys.stdin.readlines()))
     bigpat = '(' + '|'.join(pats) + ')'
     prog = re.compile(bigpat)
 
@@ -29,7 +29,7 @@
         try:
             fp = open(file, 'r')
         except IOError as msg:
-            print "%s: %s" % (file, msg)
+            print("%s: %s" % (file, msg))
             continue
         lineno = 0
         while 1:
@@ -38,7 +38,7 @@
                 break
             lineno = lineno + 1
             if prog.search(line):
-                print "%s:%s:%s" % (file, lineno, line),
+                print("%s:%s:%s" % (file, lineno, line), end=' ')
 
 def chomp(s):
     return s.rstrip('\n')
diff --git a/Demo/comparisons/sortingtest.py b/Demo/comparisons/sortingtest.py
index cabf626..464eb5c 100755
--- a/Demo/comparisons/sortingtest.py
+++ b/Demo/comparisons/sortingtest.py
@@ -42,10 +42,10 @@
         if not line:
             break
         items = line.split()
-        items = map(makekey, items)
+        items = list(map(makekey, items))
         items.sort()
         for num, var in items:
-            print "%s=%s" % (var, num),
-        print
+            print("%s=%s" % (var, num), end=' ')
+        print()
 
 main()
diff --git a/Demo/comparisons/systemtest.py b/Demo/comparisons/systemtest.py
index d3fc72b..e3d840e 100755
--- a/Demo/comparisons/systemtest.py
+++ b/Demo/comparisons/systemtest.py
@@ -25,7 +25,7 @@
         # Note: can't test for presence of lstat -- it's always there
         dummy = os.readlink
     except AttributeError:
-        print "This system doesn't have symbolic links"
+        print("This system doesn't have symbolic links")
         sys.exit(0)
     if sys.argv[1:]:
         prefix = sys.argv[1]
@@ -42,7 +42,7 @@
     try:
         names = os.listdir('.')
     except os.error as msg:
-        print "%s%s: can't list: %s" % (prefix, '.', msg)
+        print("%s%s: can't list: %s" % (prefix, '.', msg))
         return
     names.sort()
     for name in names:
@@ -51,20 +51,20 @@
         try:
             mode = os.lstat(name)[ST_MODE]
         except os.error:
-            print "%s%s: can't stat: %s" % (prefix, name, msg)
+            print("%s%s: can't stat: %s" % (prefix, name, msg))
             continue
         if S_ISLNK(mode):
             try:
                 os.stat(name)
             except os.error:
-                print "%s%s -> %s" % \
-                      (prefix, name, os.readlink(name))
+                print("%s%s -> %s" % \
+                      (prefix, name, os.readlink(name)))
         elif S_ISDIR(mode):
             try:
                 os.chdir(name)
             except os.error as msg:
-                print "%s%s: can't chdir: %s" % \
-                      (prefix, name, msg)
+                print("%s%s: can't chdir: %s" % \
+                      (prefix, name, msg))
                 continue
             try:
                 reportboguslinks(prefix + name + '/')
diff --git a/Demo/curses/life.py b/Demo/curses/life.py
index a5bbed2..ec79f9e 100755
--- a/Demo/curses/life.py
+++ b/Demo/curses/life.py
@@ -63,14 +63,14 @@
     def set(self, y, x):
         """Set a cell to the live state"""
         if x<0 or self.X<=x or y<0 or self.Y<=y:
-            raise ValueError, "Coordinates out of range %i,%i"% (y,x)
+            raise ValueError("Coordinates out of range %i,%i"% (y,x))
         self.state[x,y] = 1
 
     def toggle(self, y, x):
         """Toggle a cell's state between live and dead"""
         if x<0 or self.X<=x or y<0 or self.Y<=y:
-            raise ValueError, "Coordinates out of range %i,%i"% (y,x)
-        if self.state.has_key( (x,y) ):
+            raise ValueError("Coordinates out of range %i,%i"% (y,x))
+        if (x,y) in self.state:
             del self.state[x,y]
             self.scr.addch(y+1, x+1, ' ')
         else:
@@ -89,7 +89,7 @@
         if not update_board:
             for i in range(0, M):
                 for j in range(0, N):
-                    if self.state.has_key( (i,j) ):
+                    if (i,j) in self.state:
                         self.scr.addch(j+1, i+1, self.char)
                     else:
                         self.scr.addch(j+1, i+1, ' ')
@@ -102,10 +102,10 @@
             L = range( max(0, i-1), min(M, i+2) )
             for j in range(0, N):
                 s = 0
-                live = self.state.has_key( (i,j) )
+                live = (i,j) in self.state
                 for k in range( max(0, j-1), min(N, j+2) ):
                     for l in L:
-                        if self.state.has_key( (l,k) ):
+                        if (l,k) in self.state:
                             s += 1
                 s -= live
                 if s == 3:
diff --git a/Demo/curses/repeat.py b/Demo/curses/repeat.py
index fa7daac..1083239 100755
--- a/Demo/curses/repeat.py
+++ b/Demo/curses/repeat.py
@@ -27,14 +27,14 @@
 
 def main():
     if not sys.argv[1:]:
-        print __doc__
+        print(__doc__)
         sys.exit(0)
     cmd = " ".join(sys.argv[1:])
     p = os.popen(cmd, "r")
     text = p.read()
     sts = p.close()
     if sts:
-        print >>sys.stderr, "Exit code:", sts
+        print("Exit code:", sts, file=sys.stderr)
         sys.exit(sts)
     w = curses.initscr()
     try:
@@ -50,7 +50,7 @@
             text = p.read()
             sts = p.close()
             if sts:
-                print >>sys.stderr, "Exit code:", sts
+                print("Exit code:", sts, file=sys.stderr)
                 sys.exit(sts)
     finally:
         curses.endwin()
diff --git a/Demo/imputil/importers.py b/Demo/imputil/importers.py
index 864ff02..b617ba0 100644
--- a/Demo/imputil/importers.py
+++ b/Demo/imputil/importers.py
@@ -31,7 +31,7 @@
 _suffix = '.py' + _suffix_char
 
 # the C_EXTENSION suffixes
-_c_suffixes = filter(lambda x: x[2] == imp.C_EXTENSION, imp.get_suffixes())
+_c_suffixes = [x for x in imp.get_suffixes() if x[2] == imp.C_EXTENSION]
 
 def _timestamp(pathname):
     "Return the file modification time as a Long."
@@ -39,7 +39,7 @@
         s = os.stat(pathname)
     except OSError:
         return None
-    return long(s[8])
+    return int(s[8])
 
 def _fs_import(dir, modname, fqname):
     "Fetch a module from the filesystem."
@@ -149,7 +149,7 @@
 
         Return None if the archive was not found.
         """
-        raise RuntimeError, "get_archive not implemented"
+        raise RuntimeError("get_archive not implemented")
 
     def get_subfile(self, archive, modname):
         """Get code from a subfile in the specified archive.
@@ -162,7 +162,7 @@
 
         Return None if the subfile was not found.
         """
-        raise RuntimeError, "get_subfile not implemented"
+        raise RuntimeError("get_subfile not implemented")
 
 
 class PackageArchive(PackageArchiveImporter):
diff --git a/Demo/imputil/knee.py b/Demo/imputil/knee.py
index 26119e8..49fdf2b 100644
--- a/Demo/imputil/knee.py
+++ b/Demo/imputil/knee.py
@@ -22,10 +22,10 @@
     return m
 
 def determine_parent(globals):
-    if not globals or  not globals.has_key("__name__"):
+    if not globals or  "__name__" not in globals:
         return None
     pname = globals['__name__']
-    if globals.has_key("__path__"):
+    if "__path__" in globals:
         parent = sys.modules[pname]
         assert globals is parent.__dict__
         return parent
@@ -56,7 +56,7 @@
         parent = None
         q = import_module(head, qname, parent)
         if q: return q, tail
-    raise ImportError, "No module named " + qname
+    raise ImportError("No module named " + qname)
 
 def load_tail(q, tail):
     m = q
@@ -67,7 +67,7 @@
         mname = "%s.%s" % (m.__name__, head)
         m = import_module(head, mname, m)
         if not m:
-            raise ImportError, "No module named " + mname
+            raise ImportError("No module named " + mname)
     return m
 
 def ensure_fromlist(m, fromlist, recursive=0):
@@ -85,7 +85,7 @@
             subname = "%s.%s" % (m.__name__, sub)
             submod = import_module(sub, subname, m)
             if not submod:
-                raise ImportError, "No module named " + subname
+                raise ImportError("No module named " + subname)
 
 def import_module(partname, fqname, parent):
     try:
diff --git a/Demo/md5test/md5driver.py b/Demo/md5test/md5driver.py
index 4c7cfcb..242d0a5 100755
--- a/Demo/md5test/md5driver.py
+++ b/Demo/md5test/md5driver.py
@@ -9,7 +9,7 @@
         outstr = (outstr
                   + string.hexdigits[(o >> 4) & 0xF]
                   + string.hexdigits[o & 0xF])
-    print outstr,
+    print(outstr, end=' ')
 
 
 from time import time
@@ -39,7 +39,7 @@
 
 
     # start timer
-    print 'MD5 time trial. Processing', TEST_BYTES, 'characters...'
+    print('MD5 time trial. Processing', TEST_BYTES, 'characters...')
     t1 = time()
 
     mdContext = md5.new()
@@ -51,14 +51,14 @@
     t2 = time()
 
     MDPrint(str)
-    print 'is digest of test input.'
-    print 'Seconds to process test input:', t2 - t1
-    print 'Characters processed per second:', TEST_BYTES / (t2 - t1)
+    print('is digest of test input.')
+    print('Seconds to process test input:', t2 - t1)
+    print('Characters processed per second:', TEST_BYTES / (t2 - t1))
 
 
 def MDString(str):
     MDPrint(md5.new(str).digest())
-    print '"' + str + '"'
+    print('"' + str + '"')
 
 
 def MDFile(filename):
@@ -72,7 +72,7 @@
         mdContext.update(data)
 
     MDPrint(mdContext.digest())
-    print filename
+    print(filename)
 
 
 import sys
@@ -87,11 +87,11 @@
         mdContext.update(data)
 
     MDPrint(mdContext.digest())
-    print
+    print()
 
 
 def MDTestSuite():
-    print 'MD5 test suite results:'
+    print('MD5 test suite results:')
     MDString('')
     MDString('a')
     MDString('abc')
diff --git a/Demo/metaclasses/Enum.py b/Demo/metaclasses/Enum.py
index df1d814..8d402db 100644
--- a/Demo/metaclasses/Enum.py
+++ b/Demo/metaclasses/Enum.py
@@ -37,12 +37,12 @@
         """
         for base in bases:
             if base.__class__ is not EnumMetaClass:
-                raise TypeError, "Enumeration base class must be enumeration"
-        bases = filter(lambda x: x is not Enum, bases)
+                raise TypeError("Enumeration base class must be enumeration")
+        bases = [x for x in bases if x is not Enum]
         self.__name__ = name
         self.__bases__ = bases
         self.__dict = {}
-        for key, value in dict.items():
+        for key, value in list(dict.items()):
             self.__dict[key] = EnumInstance(name, key, value)
 
     def __getattr__(self, name):
@@ -61,7 +61,7 @@
 
         """
         if name == '__members__':
-            return self.__dict.keys()
+            return list(self.__dict.keys())
 
         try:
             return self.__dict[name]
@@ -72,16 +72,15 @@
                 except AttributeError:
                     continue
 
-        raise AttributeError, name
+        raise AttributeError(name)
 
     def __repr__(self):
         s = self.__name__
         if self.__bases__:
-            s = s + '(' + string.join(map(lambda x: x.__name__,
-                                          self.__bases__), ", ") + ')'
+            s = s + '(' + string.join([x.__name__ for x in self.__bases__], ", ") + ')'
         if self.__dict:
             list = []
-            for key, value in self.__dict.items():
+            for key, value in list(self.__dict.items()):
                 list.append("%s: %s" % (key, int(value)))
             s = "%s: {%s}" % (s, string.join(list, ", "))
         return s
@@ -130,13 +129,13 @@
         green = 2
         blue = 3
 
-    print Color.red
-    print dir(Color)
+    print(Color.red)
+    print(dir(Color))
 
-    print Color.red == Color.red
-    print Color.red == Color.blue
-    print Color.red == 1
-    print Color.red == 2
+    print(Color.red == Color.red)
+    print(Color.red == Color.blue)
+    print(Color.red == 1)
+    print(Color.red == 2)
 
     class ExtendedColor(Color):
         white = 0
@@ -145,10 +144,10 @@
         purple = 6
         black = 7
 
-    print ExtendedColor.orange
-    print ExtendedColor.red
+    print(ExtendedColor.orange)
+    print(ExtendedColor.red)
 
-    print Color.red == ExtendedColor.red
+    print(Color.red == ExtendedColor.red)
 
     class OtherColor(Enum):
         white = 4
@@ -157,13 +156,13 @@
     class MergedColor(Color, OtherColor):
         pass
 
-    print MergedColor.red
-    print MergedColor.white
+    print(MergedColor.red)
+    print(MergedColor.white)
 
-    print Color
-    print ExtendedColor
-    print OtherColor
-    print MergedColor
+    print(Color)
+    print(ExtendedColor)
+    print(OtherColor)
+    print(MergedColor)
 
 if __name__ == '__main__':
     _test()
diff --git a/Demo/metaclasses/Meta.py b/Demo/metaclasses/Meta.py
index 9529e0f..90bfd97 100644
--- a/Demo/metaclasses/Meta.py
+++ b/Demo/metaclasses/Meta.py
@@ -31,7 +31,7 @@
             try:
                 ga = self.__formalclass__.__getattr__('__usergetattr__')
             except (KeyError, AttributeError):
-                raise AttributeError, name
+                raise AttributeError(name)
             return ga(self, name)
         if type(raw) != types.FunctionType:
             return raw
@@ -71,7 +71,7 @@
                     return base.__getattr__(name)
                 except AttributeError:
                     pass
-            raise AttributeError, name
+            raise AttributeError(name)
 
     def __setattr__(self, name, value):
         if not self.__inited:
@@ -96,20 +96,20 @@
 def _test():
     class C(Meta):
         def __init__(self, *args):
-            print "__init__, args =", args
+            print("__init__, args =", args)
         def m1(self, x):
-            print "m1(x=%r)" % (x,)
-    print C
+            print("m1(x=%r)" % (x,))
+    print(C)
     x = C()
-    print x
+    print(x)
     x.m1(12)
     class D(C):
         def __getattr__(self, name):
-            if name[:2] == '__': raise AttributeError, name
+            if name[:2] == '__': raise AttributeError(name)
             return "getattr:%s" % name
     x = D()
-    print x.foo
-    print x._foo
+    print(x.foo)
+    print(x._foo)
 ##     print x.__foo
 ##     print x.__foo__
 
diff --git a/Demo/metaclasses/Simple.py b/Demo/metaclasses/Simple.py
index e3e54f7..8878ade 100644
--- a/Demo/metaclasses/Simple.py
+++ b/Demo/metaclasses/Simple.py
@@ -17,7 +17,7 @@
         try:
             value = self.__klass__.__namespace__[name]
         except KeyError:
-            raise AttributeError, name
+            raise AttributeError(name)
         if type(value) is not types.FunctionType:
             return value
         return BoundMethod(value, self)
@@ -27,7 +27,7 @@
         self.function = function
         self.instance = instance
     def __call__(self, *args):
-        print "calling", self.function, "for", self.instance, "with", args
+        print("calling", self.function, "for", self.instance, "with", args)
         return self.function(self.instance, *args)
 
 Trace = Tracing('Trace', (), {})
@@ -42,4 +42,4 @@
 
 aninstance.method1(10)
 
-print aninstance.method2()
+print(aninstance.method2())
diff --git a/Demo/metaclasses/Synch.py b/Demo/metaclasses/Synch.py
index cd13e86..445ce83 100644
--- a/Demo/metaclasses/Synch.py
+++ b/Demo/metaclasses/Synch.py
@@ -106,13 +106,13 @@
 
     def f2(lock, done=done):
         lock.acquire()
-        print "f2 running in thread %d\n" % thread.get_ident(),
+        print("f2 running in thread %d\n" % thread.get_ident(), end=' ')
         lock.release()
         done.append(1)
 
     def f1(lock, f2=f2, done=done):
         lock.acquire()
-        print "f1 running in thread %d\n" % thread.get_ident(),
+        print("f1 running in thread %d\n" % thread.get_ident(), end=' ')
         try:
             f2(lock)
         finally:
@@ -134,9 +134,9 @@
     lock.release()
     import time
     while len(done) < 9:
-        print len(done)
+        print(len(done))
         time.sleep(0.001)
-    print len(done)
+    print(len(done))
 
 
 # Now, the Locking metaclass is a piece of cake.
@@ -183,22 +183,22 @@
                 return
             # Double the buffer size
             # First normalize it so that first==0 and last==size-1
-            print "buffer =", self.buffer
-            print "first = %d, last = %d, size = %d" % (
-                self.first, self.last, self.size)
+            print("buffer =", self.buffer)
+            print("first = %d, last = %d, size = %d" % (
+                self.first, self.last, self.size))
             if self.first <= self.last:
                 temp = self.buffer[self.first:self.last]
             else:
                 temp = self.buffer[self.first:] + self.buffer[:self.last]
-            print "temp =", temp
+            print("temp =", temp)
             self.buffer = temp + [None]*(self.size+1)
             self.first = 0
             self.last = self.size-1
             self.size = self.size*2
-            print "Buffer size doubled to", self.size
-            print "new buffer =", self.buffer
-            print "first = %d, last = %d, size = %d" % (
-                self.first, self.last, self.size)
+            print("Buffer size doubled to", self.size)
+            print("new buffer =", self.buffer)
+            print("first = %d, last = %d, size = %d" % (
+                self.first, self.last, self.size))
             self.put(item)              # Recursive call to test the locking
         def get(self):
             # Is the buffer empty?
@@ -212,10 +212,10 @@
         import time
         i = 0
         while i < n:
-            print "put", i
+            print("put", i)
             buffer.put(i)
             i = i+1
-        print "Producer: done producing", n, "items"
+        print("Producer: done producing", n, "items")
         wait.release()
 
     def consumer(buffer, wait, n=1000):
@@ -226,15 +226,14 @@
             try:
                 x = buffer.get()
                 if x != i:
-                    raise AssertionError, \
-                          "get() returned %s, expected %s" % (x, i)
-                print "got", i
+                    raise AssertionError("get() returned %s, expected %s" % (x, i))
+                print("got", i)
                 i = i+1
                 tout = 0.001
             except EOFError:
                 time.sleep(tout)
                 tout = tout*2
-        print "Consumer: done consuming", n, "items"
+        print("Consumer: done consuming", n, "items")
         wait.release()
 
     pwait = thread.allocate_lock()
@@ -246,10 +245,10 @@
     thread.start_new_thread(consumer, (buffer, cwait, n))
     thread.start_new_thread(producer, (buffer, pwait, n))
     pwait.acquire()
-    print "Producer done"
+    print("Producer done")
     cwait.acquire()
-    print "All done"
-    print "buffer size ==", len(buffer.buffer)
+    print("All done")
+    print("buffer size ==", len(buffer.buffer))
 
 if __name__ == '__main__':
     _testLock()
diff --git a/Demo/metaclasses/Trace.py b/Demo/metaclasses/Trace.py
index 97fda56..d211d17 100644
--- a/Demo/metaclasses/Trace.py
+++ b/Demo/metaclasses/Trace.py
@@ -35,7 +35,7 @@
                     return base.__getattr__(name)
                 except AttributeError:
                     pass
-            raise AttributeError, name
+            raise AttributeError(name)
 
     def __setattr__(self, name, value):
         if not self.__inited:
@@ -69,7 +69,7 @@
         try:
             raw = self.__class.__getattr__(name)
         except AttributeError:
-            raise AttributeError, name
+            raise AttributeError(name)
         if type(raw) != types.FunctionType:
             return raw
         # It's a function
@@ -99,7 +99,7 @@
             self.inst.__trace_call__(self.inst.__trace_output__,
                                      "returning from %s with exception %s: %s",
                                      self.__name__, t, v)
-            raise t, v, tb
+            raise t(v).with_traceback(tb)
         else:
             self.inst.__trace_call__(self.inst.__trace_output__,
                                      "returning from %s with value %s",
@@ -117,28 +117,28 @@
         def m2(self, y): return self.x + y
         __trace_output__ = sys.stdout
     class D(C):
-        def m2(self, y): print "D.m2(%r)" % (y,); return C.m2(self, y)
+        def m2(self, y): print("D.m2(%r)" % (y,)); return C.m2(self, y)
         __trace_output__ = None
     x = C(4321)
-    print x
-    print x.x
-    print x.m1(100)
-    print x.m1(10)
-    print x.m2(33)
-    print x.m1(5)
-    print x.m2(4000)
-    print x.x
+    print(x)
+    print(x.x)
+    print(x.m1(100))
+    print(x.m1(10))
+    print(x.m2(33))
+    print(x.m1(5))
+    print(x.m2(4000))
+    print(x.x)
 
-    print C.__init__
-    print C.m2
-    print D.__init__
-    print D.m2
+    print(C.__init__)
+    print(C.m2)
+    print(D.__init__)
+    print(D.m2)
 
     y = D()
-    print y
-    print y.m1(10)
-    print y.m2(100)
-    print y.x
+    print(y)
+    print(y.m1(10))
+    print(y.m2(100))
+    print(y.x)
 
 if __name__ == '__main__':
     _test()
diff --git a/Demo/newmetaclasses/Eiffel.py b/Demo/newmetaclasses/Eiffel.py
index 04f9915..ef7f0c6 100644
--- a/Demo/newmetaclasses/Eiffel.py
+++ b/Demo/newmetaclasses/Eiffel.py
@@ -20,7 +20,7 @@
         """
         # find methods with pre or post conditions
         methods = []
-        for k, v in dict.iteritems():
+        for k, v in dict.items():
             if k.endswith('_pre') or k.endswith('_post'):
                 assert isinstance(v, function)
             elif isinstance(v, function):
diff --git a/Demo/newmetaclasses/Enum.py b/Demo/newmetaclasses/Enum.py
index 2a5823b..0f7f913 100644
--- a/Demo/newmetaclasses/Enum.py
+++ b/Demo/newmetaclasses/Enum.py
@@ -20,7 +20,7 @@
     def __init__(cls, name, bases, dict):
         super(EnumMetaclass, cls).__init__(name, bases, dict)
         cls._members = []
-        for attr in dict.keys():
+        for attr in list(dict.keys()):
             if not (attr.startswith('__') and attr.endswith('__')):
                 enumval = EnumInstance(name, attr, dict[attr])
                 setattr(cls, attr, enumval)
@@ -29,7 +29,7 @@
     def __getattr__(cls, name):
         if name == "__members__":
             return cls._members
-        raise AttributeError, name
+        raise AttributeError(name)
 
     def __repr__(cls):
         s1 = s2 = ""
@@ -95,13 +95,13 @@
         green = 2
         blue = 3
 
-    print Color.red
+    print(Color.red)
 
-    print repr(Color.red)
-    print Color.red == Color.red
-    print Color.red == Color.blue
-    print Color.red == 1
-    print Color.red == 2
+    print(repr(Color.red))
+    print(Color.red == Color.red)
+    print(Color.red == Color.blue)
+    print(Color.red == 1)
+    print(Color.red == 2)
 
     class ExtendedColor(Color):
         white = 0
@@ -110,10 +110,10 @@
         purple = 6
         black = 7
 
-    print ExtendedColor.orange
-    print ExtendedColor.red
+    print(ExtendedColor.orange)
+    print(ExtendedColor.red)
 
-    print Color.red == ExtendedColor.red
+    print(Color.red == ExtendedColor.red)
 
     class OtherColor(Enum):
         white = 4
@@ -122,13 +122,13 @@
     class MergedColor(Color, OtherColor):
         pass
 
-    print MergedColor.red
-    print MergedColor.white
+    print(MergedColor.red)
+    print(MergedColor.white)
 
-    print Color
-    print ExtendedColor
-    print OtherColor
-    print MergedColor
+    print(Color)
+    print(ExtendedColor)
+    print(OtherColor)
+    print(MergedColor)
 
 def _test2():
 
@@ -137,13 +137,13 @@
         green = 2
         blue = 3
 
-    print Color.red
+    print(Color.red)
 
-    print repr(Color.red)
-    print Color.red == Color.red
-    print Color.red == Color.blue
-    print Color.red == 1
-    print Color.red == 2
+    print(repr(Color.red))
+    print(Color.red == Color.red)
+    print(Color.red == Color.blue)
+    print(Color.red == 1)
+    print(Color.red == 2)
 
     class ExtendedColor(Color):
         white = 0
@@ -152,10 +152,10 @@
         purple = 6
         black = 7
 
-    print ExtendedColor.orange
-    print ExtendedColor.red
+    print(ExtendedColor.orange)
+    print(ExtendedColor.red)
 
-    print Color.red == ExtendedColor.red
+    print(Color.red == ExtendedColor.red)
 
     class OtherColor(FullEnum):
         white = 4
@@ -164,13 +164,13 @@
     class MergedColor(Color, OtherColor):
         pass
 
-    print MergedColor.red
-    print MergedColor.white
+    print(MergedColor.red)
+    print(MergedColor.white)
 
-    print Color
-    print ExtendedColor
-    print OtherColor
-    print MergedColor
+    print(Color)
+    print(ExtendedColor)
+    print(OtherColor)
+    print(MergedColor)
 
 if __name__ == '__main__':
     _test()
diff --git a/Demo/parser/example.py b/Demo/parser/example.py
index 2aa9ec2..c2f0883 100644
--- a/Demo/parser/example.py
+++ b/Demo/parser/example.py
@@ -63,7 +63,7 @@
         return self._name
 
     def get_class_names(self):
-        return self._class_info.keys()
+        return list(self._class_info.keys())
 
     def get_class_info(self, name):
         return self._class_info[name]
@@ -79,7 +79,7 @@
     #  Mixin class providing access to function names and info.
 
     def get_function_names(self):
-        return self._function_info.keys()
+        return list(self._function_info.keys())
 
     def get_function_info(self, name):
         return self._function_info[name]
@@ -97,7 +97,7 @@
         SuiteInfoBase.__init__(self, tree and tree[-1] or None)
 
     def get_method_names(self):
-        return self._function_info.keys()
+        return list(self._function_info.keys())
 
     def get_method_info(self, name):
         return self._function_info[name]
diff --git a/Demo/parser/test_parser.py b/Demo/parser/test_parser.py
index 1589f3b..e4d5571 100755
--- a/Demo/parser/test_parser.py
+++ b/Demo/parser/test_parser.py
@@ -9,7 +9,7 @@
 
 def testChunk(t, fileName):
     global _numFailed
-    print '----', fileName,
+    print('----', fileName, end=' ')
     try:
         ast = parser.suite(t)
         tup = parser.ast2tuple(ast)
@@ -18,17 +18,17 @@
         ast = None
         new = parser.tuple2ast(tup)
     except parser.ParserError as err:
-        print
-        print 'parser module raised exception on input file', fileName + ':'
+        print()
+        print('parser module raised exception on input file', fileName + ':')
         traceback.print_exc()
         _numFailed = _numFailed + 1
     else:
         if tup != parser.ast2tuple(new):
-            print
-            print 'parser module failed on input file', fileName
+            print()
+            print('parser module failed on input file', fileName)
             _numFailed = _numFailed + 1
         else:
-            print 'o.k.'
+            print('o.k.')
 
 def testFile(fileName):
     t = open(fileName).read()
@@ -41,7 +41,7 @@
         import glob
         args = glob.glob("*.py")
         args.sort()
-    map(testFile, args)
+    list(map(testFile, args))
     sys.exit(_numFailed != 0)
 
 if __name__ == '__main__':
diff --git a/Demo/parser/unparse.py b/Demo/parser/unparse.py
index 751ea6f..6582487 100644
--- a/Demo/parser/unparse.py
+++ b/Demo/parser/unparse.py
@@ -1,7 +1,7 @@
 "Usage: unparse.py <path to source file>"
 import sys
 import _ast
-import cStringIO
+import io
 import os
 
 def interleave(inter, f, seq):
@@ -9,7 +9,7 @@
     """
     seq = iter(seq)
     try:
-        f(seq.next())
+        f(next(seq))
     except StopIteration:
         pass
     else:
@@ -28,7 +28,7 @@
         self.f = file
         self._indent = 0
         self.dispatch(tree)
-        print >>self.f,""
+        print("", file=self.f)
         self.f.flush()
 
     def fill(self, text = ""):
@@ -326,7 +326,8 @@
 
     def _Dict(self, t):
         self.write("{")
-        def writem((k, v)):
+        def writem(xxx_todo_changeme):
+            (k, v) = xxx_todo_changeme
             self.dispatch(k)
             self.write(": ")
             self.dispatch(v)
@@ -482,17 +483,17 @@
     try:
         names = [n for n in os.listdir(a) if n.endswith('.py')]
     except OSError:
-        print >> sys.stderr, "Directory not readable: %s" % a
+        print("Directory not readable: %s" % a, file=sys.stderr)
     else:
         for n in names:
             fullname = os.path.join(a, n)
             if os.path.isfile(fullname):
-                output = cStringIO.StringIO()
-                print 'Testing %s' % fullname
+                output = io.StringIO()
+                print('Testing %s' % fullname)
                 try:
                     roundtrip(fullname, output)
                 except Exception as e:
-                    print '  Failed to compile, exception is %s' % repr(e)
+                    print('  Failed to compile, exception is %s' % repr(e))
             elif os.path.isdir(fullname):
                 testdir(fullname)
 
diff --git a/Demo/pdist/FSProxy.py b/Demo/pdist/FSProxy.py
index dad4015..510ac76 100755
--- a/Demo/pdist/FSProxy.py
+++ b/Demo/pdist/FSProxy.py
@@ -88,7 +88,7 @@
                     c, t = fs.GetCreatorType()
                     if t != 'TEXT': return 0
                 except macfs.error as msg:
-                    print "***", name, msg
+                    print("***", name, msg)
                     return 0
         else:
             if os.path.islink(name): return 0
@@ -99,12 +99,12 @@
 
     def check(self, name):
         if not self.visible(name):
-            raise os.error, "protected name %s" % repr(name)
+            raise os.error("protected name %s" % repr(name))
 
     def checkfile(self, name):
         self.check(name)
         if not os.path.isfile(name):
-            raise os.error, "not a plain file %s" % repr(name)
+            raise os.error("not a plain file %s" % repr(name))
 
     def pwd(self):
         return os.getcwd()
@@ -118,7 +118,7 @@
 
     def back(self):
         if not self._dirstack:
-            raise os.error, "empty directory stack"
+            raise os.error("empty directory stack")
         dir, ignore = self._dirstack[-1]
         os.chdir(dir)
         del self._dirstack[-1]
@@ -128,8 +128,8 @@
         if pat:
             def keep(name, pat = pat):
                 return fnmatch.fnmatch(name, pat)
-            files = filter(keep, files)
-        files = filter(self.visible, files)
+            files = list(filter(keep, files))
+        files = list(filter(self.visible, files))
         files.sort()
         return files
 
@@ -139,12 +139,12 @@
 
     def listfiles(self, pat = None):
         files = os.listdir(os.curdir)
-        files = filter(os.path.isfile, files)
+        files = list(filter(os.path.isfile, files))
         return self._filter(files, pat)
 
     def listsubdirs(self, pat = None):
         files = os.listdir(os.curdir)
-        files = filter(os.path.isdir, files)
+        files = list(filter(os.path.isdir, files))
         return self._filter(files, pat)
 
     def exists(self, name):
@@ -278,7 +278,7 @@
 
     def mkdir(self, name):
         self.check(name)
-        os.mkdir(name, 0777)
+        os.mkdir(name, 0o777)
 
     def rmdir(self, name):
         self.check(name)
diff --git a/Demo/pdist/RCSProxy.py b/Demo/pdist/RCSProxy.py
index 6732308..7c3b24f 100755
--- a/Demo/pdist/RCSProxy.py
+++ b/Demo/pdist/RCSProxy.py
@@ -50,21 +50,21 @@
 
     def back(self):
         if not self._dirstack:
-            raise os.error, "empty directory stack"
+            raise os.error("empty directory stack")
         dir = self._dirstack[-1]
         os.chdir(dir)
         del self._dirstack[-1]
 
     def listsubdirs(self, pat = None):
         files = os.listdir(os.curdir)
-        files = filter(os.path.isdir, files)
+        files = list(filter(os.path.isdir, files))
         return self._filter(files, pat)
 
     def isdir(self, name):
         return os.path.isdir(name)
 
     def mkdir(self, name):
-        os.mkdir(name, 0777)
+        os.mkdir(name, 0o777)
 
     def rmdir(self, name):
         os.rmdir(name)
@@ -186,11 +186,11 @@
     if hasattr(proxy, what):
         attr = getattr(proxy, what)
         if hasattr(attr, '__call__'):
-            print attr(*sys.argv[2:])
+            print(attr(*sys.argv[2:]))
         else:
-            print repr(attr)
+            print(repr(attr))
     else:
-        print "%s: no such attribute" % what
+        print("%s: no such attribute" % what)
         sys.exit(2)
 
 
diff --git a/Demo/pdist/client.py b/Demo/pdist/client.py
index 664c41b..13158f2 100755
--- a/Demo/pdist/client.py
+++ b/Demo/pdist/client.py
@@ -24,10 +24,10 @@
             address = ('', address)
         self._address = address
         self._verbose = verbose
-        if self._verbose: print "Connecting to %s ..." % repr(address)
+        if self._verbose: print("Connecting to %s ..." % repr(address))
         self._socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
         self._socket.connect(address)
-        if self._verbose: print "Connected."
+        if self._verbose: print("Connected.")
         self._lastid = 0 # Last id for which a reply has been received
         self._nextid = 1 # Id of next request
         self._replies = {} # Unprocessed replies
@@ -53,7 +53,7 @@
             method = _stub(self, name)
             setattr(self, name, method) # XXX circular reference
             return method
-        raise AttributeError, name
+        raise AttributeError(name)
 
     def _setverbose(self, verbose):
         self._verbose = verbose
@@ -78,7 +78,7 @@
         self._nextid = id+1
         if not wantreply: id = -id
         request = (name, args, id)
-        if self._verbose > 1: print "sending request: %s" % repr(request)
+        if self._verbose > 1: print("sending request: %s" % repr(request))
         wp = pickle.Pickler(self._wf)
         wp.dump(request)
         return id
@@ -86,7 +86,7 @@
     def _recv(self, id):
         exception, value, rid = self._vrecv(id)
         if rid != id:
-            raise RuntimeError, "request/reply id mismatch: %d/%d" % (id, rid)
+            raise RuntimeError("request/reply id mismatch: %d/%d" % (id, rid))
         if exception is None:
             return value
         x = exception
@@ -96,30 +96,30 @@
             x = os.error
         if x == exception:
             exception = x
-        raise exception, value
+        raise exception(value)
 
     def _vrecv(self, id):
         self._flush()
-        if self._replies.has_key(id):
-            if self._verbose > 1: print "retrieving previous reply, id = %d" % id
+        if id in self._replies:
+            if self._verbose > 1: print("retrieving previous reply, id = %d" % id)
             reply = self._replies[id]
             del self._replies[id]
             return reply
         aid = abs(id)
         while 1:
-            if self._verbose > 1: print "waiting for reply, id = %d" % id
+            if self._verbose > 1: print("waiting for reply, id = %d" % id)
             rp = pickle.Unpickler(self._rf)
             reply = rp.load()
             del rp
-            if self._verbose > 1: print "got reply: %s" % repr(reply)
+            if self._verbose > 1: print("got reply: %s" % repr(reply))
             rid = reply[2]
             arid = abs(rid)
             if arid == aid:
-                if self._verbose > 1: print "got it"
+                if self._verbose > 1: print("got it")
                 return reply
             self._replies[rid] = reply
             if arid > aid:
-                if self._verbose > 1: print "got higher id, assume all ok"
+                if self._verbose > 1: print("got higher id, assume all ok")
                 return (None, None, id)
 
     def _flush(self):
@@ -138,7 +138,7 @@
         line = self._rf.readline()
         challenge = int(line.strip())
         response = self._encode_challenge(challenge)
-        line = repr(long(response))
+        line = repr(int(response))
         if line[-1] in 'Ll': line = line[:-1]
         self._wf.write(line + '\n')
         self._wf.flush()
diff --git a/Demo/pdist/cmdfw.py b/Demo/pdist/cmdfw.py
index 47d13bc..7bcb461 100755
--- a/Demo/pdist/cmdfw.py
+++ b/Demo/pdist/cmdfw.py
@@ -72,11 +72,11 @@
         """Process the options retrieved by getopt.
         Override this if you have any options."""
         if opts:
-            print "-"*40
-            print "Options:"
+            print("-"*40)
+            print("Options:")
             for o, a in opts:
-                print 'option', o, 'value', repr(a)
-            print "-"*40
+                print('option', o, 'value', repr(a))
+            print("-"*40)
 
     def ready(self):
         """Called just before calling the subcommand."""
@@ -84,14 +84,14 @@
 
     def usage(self, msg = None):
         """Print usage message.  Return suitable exit code (2)."""
-        if msg: print msg
-        print self.UsageMessage % {'name': self.__class__.__name__}
+        if msg: print(msg)
+        print(self.UsageMessage % {'name': self.__class__.__name__})
         docstrings = {}
         c = self.__class__
         while 1:
             for name in dir(c):
                 if name[:3] == 'do_':
-                    if docstrings.has_key(name):
+                    if name in docstrings:
                         continue
                     try:
                         doc = getattr(c, name).__doc__
@@ -103,19 +103,19 @@
                 break
             c = c.__bases__[0]
         if docstrings:
-            print "where subcommand can be:"
-            names = docstrings.keys()
+            print("where subcommand can be:")
+            names = list(docstrings.keys())
             names.sort()
             for name in names:
-                print docstrings[name]
+                print(docstrings[name])
         if self.PostUsageMessage:
-            print self.PostUsageMessage
+            print(self.PostUsageMessage)
         return 2
 
     def default(self):
         """Default method, called when no subcommand is given.
         You should always override this."""
-        print "Nobody expects the Spanish Inquisition!"
+        print("Nobody expects the Spanish Inquisition!")
 
 
 def test():
@@ -124,7 +124,7 @@
     class Hello(CommandFrameWork):
         def do_hello(self, opts, args):
             "hello -- print 'hello world', needs no arguments"
-            print "Hello, world"
+            print("Hello, world")
     x = Hello()
     tests = [
             [],
@@ -135,9 +135,9 @@
             None,
             ]
     for t in tests:
-        print '-'*10, t, '-'*10
+        print('-'*10, t, '-'*10)
         sts = x.run(t)
-        print "Exit status:", repr(sts)
+        print("Exit status:", repr(sts))
 
 
 if __name__ == '__main__':
diff --git a/Demo/pdist/cmptree.py b/Demo/pdist/cmptree.py
index 5031869..d6962e9 100755
--- a/Demo/pdist/cmptree.py
+++ b/Demo/pdist/cmptree.py
@@ -13,7 +13,7 @@
 
 def main():
     pwd = os.getcwd()
-    s = raw_input("chdir [%s] " % pwd)
+    s = input("chdir [%s] " % pwd)
     if s:
         os.chdir(s)
         pwd = os.getcwd()
@@ -21,14 +21,14 @@
     port = 4127
     verbose = 1
     mode = ''
-    print """\
+    print("""\
 Mode should be a string of characters, indicating what to do with differences.
 r - read different files to local file system
 w - write different files to remote file system
 c - create new files, either remote or local
 d - delete disappearing files, either remote or local
-"""
-    s = raw_input("mode [%s] " % mode)
+""")
+    s = input("mode [%s] " % mode)
     if s: mode = s
     address = (host, port)
     t1 = time.time()
@@ -40,74 +40,74 @@
     t2 = time.time()
     dt = t2-t1
     mins, secs = divmod(dt, 60)
-    print mins, "minutes and", round(secs), "seconds"
-    raw_input("[Return to exit] ")
+    print(mins, "minutes and", round(secs), "seconds")
+    input("[Return to exit] ")
 
 def ask(prompt, default):
-    s = raw_input("%s [%s] " % (prompt, default))
+    s = input("%s [%s] " % (prompt, default))
     return s or default
 
 def askint(prompt, default):
-    s = raw_input("%s [%s] " % (prompt, str(default)))
+    s = input("%s [%s] " % (prompt, str(default)))
     if s: return string.atoi(s)
     return default
 
 def compare(local, remote, mode):
-    print
-    print "PWD =", repr(os.getcwd())
+    print()
+    print("PWD =", repr(os.getcwd()))
     sums_id = remote._send('sumlist')
     subdirs_id = remote._send('listsubdirs')
     remote._flush()
-    print "calculating local sums ..."
+    print("calculating local sums ...")
     lsumdict = {}
     for name, info in local.sumlist():
         lsumdict[name] = info
-    print "getting remote sums ..."
+    print("getting remote sums ...")
     sums = remote._recv(sums_id)
-    print "got", len(sums)
+    print("got", len(sums))
     rsumdict = {}
     for name, rsum in sums:
         rsumdict[name] = rsum
-        if not lsumdict.has_key(name):
-            print repr(name), "only remote"
+        if name not in lsumdict:
+            print(repr(name), "only remote")
             if 'r' in mode and 'c' in mode:
                 recvfile(local, remote, name)
         else:
             lsum = lsumdict[name]
             if lsum != rsum:
-                print repr(name),
+                print(repr(name), end=' ')
                 rmtime = remote.mtime(name)
                 lmtime = local.mtime(name)
                 if rmtime > lmtime:
-                    print "remote newer",
+                    print("remote newer", end=' ')
                     if 'r' in mode:
                         recvfile(local, remote, name)
                 elif lmtime > rmtime:
-                    print "local newer",
+                    print("local newer", end=' ')
                     if 'w' in mode:
                         sendfile(local, remote, name)
                 else:
-                    print "same mtime but different sum?!?!",
-                print
-    for name in lsumdict.keys():
-        if not rsumdict.keys():
-            print repr(name), "only locally",
+                    print("same mtime but different sum?!?!", end=' ')
+                print()
+    for name in list(lsumdict.keys()):
+        if not list(rsumdict.keys()):
+            print(repr(name), "only locally", end=' ')
             fl()
             if 'w' in mode and 'c' in mode:
                 sendfile(local, remote, name)
             elif 'r' in mode and 'd' in mode:
                 os.unlink(name)
-                print "removed."
-            print
-    print "gettin subdirs ..."
+                print("removed.")
+            print()
+    print("gettin subdirs ...")
     subdirs = remote._recv(subdirs_id)
     common = []
     for name in subdirs:
         if local.isdir(name):
-            print "Common subdirectory", repr(name)
+            print("Common subdirectory", repr(name))
             common.append(name)
         else:
-            print "Remote subdirectory", repr(name), "not found locally"
+            print("Remote subdirectory", repr(name), "not found locally")
             if 'r' in mode and 'c' in mode:
                 pr = "Create local subdirectory %s? [y] " % \
                      repr(name)
@@ -117,15 +117,15 @@
                     ok = ask(pr, "y")
                 if ok[:1] in ('y', 'Y'):
                     local.mkdir(name)
-                    print "Subdirectory %s made" % \
-                            repr(name)
+                    print("Subdirectory %s made" % \
+                            repr(name))
                     common.append(name)
     lsubdirs = local.listsubdirs()
     for name in lsubdirs:
         if name not in subdirs:
-            print "Local subdirectory", repr(name), "not found remotely"
+            print("Local subdirectory", repr(name), "not found remotely")
     for name in common:
-        print "Entering subdirectory", repr(name)
+        print("Entering subdirectory", repr(name))
         local.cd(name)
         remote.cd(name)
         compare(local, remote, mode)
@@ -136,10 +136,10 @@
     try:
         remote.create(name)
     except (IOError, os.error) as msg:
-        print "cannot create:", msg
+        print("cannot create:", msg)
         return
 
-    print "sending ...",
+    print("sending ...", end=' ')
     fl()
 
     data = open(name).read()
@@ -152,10 +152,10 @@
     t2 = time.time()
 
     dt = t2-t1
-    print len(data), "bytes in", round(dt), "seconds",
+    print(len(data), "bytes in", round(dt), "seconds", end=' ')
     if dt:
-        print "i.e.", round(len(data)/dt), "bytes/sec",
-    print
+        print("i.e.", round(len(data)/dt), "bytes/sec", end=' ')
+    print()
 
 def recvfile(local, remote, name):
     ok = 0
@@ -165,17 +165,17 @@
         return rv
     finally:
         if not ok:
-            print "*** recvfile of %r failed, deleting" % (name,)
+            print("*** recvfile of %r failed, deleting" % (name,))
             local.delete(name)
 
 def recvfile_real(local, remote, name):
     try:
         local.create(name)
     except (IOError, os.error) as msg:
-        print "cannot create:", msg
+        print("cannot create:", msg)
         return
 
-    print "receiving ...",
+    print("receiving ...", end=' ')
     fl()
 
     f = open(name, 'w')
@@ -200,10 +200,10 @@
     f.close()
 
     dt = t2-t1
-    print size, "bytes in", round(dt), "seconds",
+    print(size, "bytes in", round(dt), "seconds", end=' ')
     if dt:
-        print "i.e.", int(size/dt), "bytes/sec",
-    print
+        print("i.e.", int(size/dt), "bytes/sec", end=' ')
+    print()
     remote._recv(id) # ignored
 
 def fl():
diff --git a/Demo/pdist/cvslib.py b/Demo/pdist/cvslib.py
index ebcc697..8ccb616 100755
--- a/Demo/pdist/cvslib.py
+++ b/Demo/pdist/cvslib.py
@@ -56,7 +56,7 @@
 
     def __init__(self, file = None):
         if file and '/' in file:
-            raise ValueError, "no slash allowed in file"
+            raise ValueError("no slash allowed in file")
         self.file = file
         self.lseen = self.eseen = self.rseen = 0
         self.proxy = None
@@ -76,7 +76,7 @@
     def getentry(self, line):
         words = string.splitfields(line, '/')
         if self.file and words[1] != self.file:
-            raise ValueError, "file name mismatch"
+            raise ValueError("file name mismatch")
         self.file = words[1]
         self.erev = words[2]
         self.edeleted = 0
@@ -146,13 +146,13 @@
                 self.extra)
 
     def report(self):
-        print '-'*50
+        print('-'*50)
         def r(key, repr=repr, self=self):
             try:
                 value = repr(getattr(self, key))
             except AttributeError:
                 value = "?"
-            print "%-15s:" % key, value
+            print("%-15s:" % key, value)
         r("file")
         if self.lseen:
             r("lsum", hexify)
@@ -200,7 +200,7 @@
         if proxy is self.proxy:
             return
         self.proxy = proxy
-        for e in self.entries.values():
+        for e in list(self.entries.values()):
             e.rseen = 0
 
     def getentries(self):
@@ -218,12 +218,12 @@
     def putentries(self):
         """Write CVS/Entries back"""
         f = self.cvsopen("Entries", 'w')
-        for e in self.values():
+        for e in list(self.values()):
             f.write(e.putentry())
         f.close()
 
     def getlocalfiles(self):
-        list = self.entries.keys()
+        list = list(self.entries.keys())
         addlist = os.listdir(os.curdir)
         for name in addlist:
             if name in list:
@@ -242,7 +242,7 @@
         if proxy:
             self.proxy = proxy
         if not self.proxy:
-            raise RuntimeError, "no RCS proxy"
+            raise RuntimeError("no RCS proxy")
         addlist = self.proxy.listfiles()
         for file in addlist:
             try:
@@ -252,24 +252,24 @@
             e.getremote(self.proxy)
 
     def report(self):
-        for e in self.values():
+        for e in list(self.values()):
             e.report()
-        print '-'*50
+        print('-'*50)
 
     def keys(self):
-        keys = self.entries.keys()
+        keys = list(self.entries.keys())
         keys.sort()
         return keys
 
     def values(self):
         def value(key, self=self):
             return self.entries[key]
-        return map(value, self.keys())
+        return list(map(value, list(self.keys())))
 
     def items(self):
         def item(key, self=self):
             return (key, self.entries[key])
-        return map(item, self.keys())
+        return list(map(item, list(self.keys())))
 
     def cvsexists(self, file):
         file = os.path.join("CVS", file)
@@ -328,7 +328,7 @@
     year = string.atoi(words[4])
     month = unctime_monthmap[words[1]]
     day = string.atoi(words[2])
-    [hh, mm, ss] = map(string.atoi, string.splitfields(words[3], ':'))
+    [hh, mm, ss] = list(map(string.atoi, string.splitfields(words[3], ':')))
     ss = ss - time.timezone
     return time.mktime((year, month, day, hh, mm, ss, 0, 0, 0))
 
@@ -340,14 +340,14 @@
     now = int(time.time())
     t = time.gmtime(now)
     at = time.asctime(t)
-    print 'GMT', now, at
-    print 'timezone', time.timezone
-    print 'local', time.ctime(now)
+    print('GMT', now, at)
+    print('timezone', time.timezone)
+    print('local', time.ctime(now))
     u = unctime(at)
-    print 'unctime()', u
+    print('unctime()', u)
     gu = time.gmtime(u)
-    print '->', gu
-    print time.asctime(gu)
+    print('->', gu)
+    print(time.asctime(gu))
 
 def test():
     x = CVS()
diff --git a/Demo/pdist/cvslock.py b/Demo/pdist/cvslock.py
index c93c3f6..a48c702 100755
--- a/Demo/pdist/cvslock.py
+++ b/Demo/pdist/cvslock.py
@@ -120,14 +120,14 @@
         self.cvswfl = self.join(CVSWFL + pid)
 
     def __del__(self):
-        print "__del__"
+        print("__del__")
         self.unlock()
 
     def setlockdir(self):
         while 1:
             try:
                 self.lockdir = self.cvslck
-                os.mkdir(self.cvslck, 0777)
+                os.mkdir(self.cvslck, 0o777)
                 return
             except os.error as msg:
                 self.lockdir = None
@@ -147,7 +147,7 @@
 
     def unlockfile(self):
         if self.lockfile:
-            print "unlink", self.lockfile
+            print("unlink", self.lockfile)
             try:
                 os.unlink(self.lockfile)
             except os.error:
@@ -156,7 +156,7 @@
 
     def unlockdir(self):
         if self.lockdir:
-            print "rmdir", self.lockdir
+            print("rmdir", self.lockdir)
             try:
                 os.rmdir(self.lockdir)
             except os.error:
@@ -179,8 +179,8 @@
         user = pwent[0]
     except KeyError:
         user = "uid %d" % uid
-    print "[%s]" % time.ctime(time.time())[11:19],
-    print "Waiting for %s's lock in" % user, repository
+    print("[%s]" % time.ctime(time.time())[11:19], end=' ')
+    print("Waiting for %s's lock in" % user, repository)
     time.sleep(delay)
 
 
@@ -252,27 +252,27 @@
     rl = None
     wl = None
     try:
-        print "attempting write lock ..."
+        print("attempting write lock ...")
         wl = WriteLock(repository)
-        print "got it."
+        print("got it.")
         wl.unlock()
-        print "attempting read lock ..."
+        print("attempting read lock ...")
         rl = ReadLock(repository)
-        print "got it."
+        print("got it.")
         rl.unlock()
     finally:
-        print [1]
-        print [2]
+        print([1])
+        print([2])
         if rl:
             rl.unlock()
-        print [3]
+        print([3])
         if wl:
             wl.unlock()
-        print [4]
+        print([4])
         rl = None
-        print [5]
+        print([5])
         wl = None
-        print [6]
+        print([6])
 
 
 if __name__ == '__main__':
diff --git a/Demo/pdist/mac.py b/Demo/pdist/mac.py
index 61cff09..beb77ec 100755
--- a/Demo/pdist/mac.py
+++ b/Demo/pdist/mac.py
@@ -9,7 +9,7 @@
 def main():
     while 1:
         try:
-            line = raw_input('$ ')
+            line = input('$ ')
         except EOFError:
             break
         words = line.split()
diff --git a/Demo/pdist/makechangelog.py b/Demo/pdist/makechangelog.py
index 1ffa588..db66e8f 100755
--- a/Demo/pdist/makechangelog.py
+++ b/Demo/pdist/makechangelog.py
@@ -50,25 +50,25 @@
     if parsedateprog.match(dateline) >= 0:
         fields = parsedateprog.group(1, 2, 3, 4, 5, 6)
         author = parsedateprog.group(7)
-        if authormap.has_key(author): author = authormap[author]
-        tfields = map(string.atoi, fields) + [0, 0, 0]
+        if author in authormap: author = authormap[author]
+        tfields = list(map(string.atoi, fields)) + [0, 0, 0]
         tfields[5] = tfields[5] - time.timezone
         t = time.mktime(tuple(tfields))
-        print time.ctime(t), '', author
+        print(time.ctime(t), '', author)
         words = string.split(log)
         words[:0] = ['*', prefix + file + ':']
         maxcol = 72-8
         col = maxcol
         for word in words:
             if col > 0 and col + len(word) >= maxcol:
-                print
-                print '\t' + word,
+                print()
+                print('\t' + word, end=' ')
                 col = -1
             else:
-                print word,
+                print(word, end=' ')
             col = col + 1 + len(word)
-        print
-        print
+        print()
+        print()
 
 startprog = re.compile("^Working file: (.*)$")
 
diff --git a/Demo/pdist/rcslib.py b/Demo/pdist/rcslib.py
index 3e63869..9690f3b 100755
--- a/Demo/pdist/rcslib.py
+++ b/Demo/pdist/rcslib.py
@@ -90,7 +90,7 @@
                 dict[key] = value
         status = self._closepipe(f)
         if status:
-            raise IOError, status
+            raise IOError(status)
         return dict
 
     # --- Methods that change files ---
@@ -160,12 +160,12 @@
     def listfiles(self, pat = None):
         """Return a list of all version files matching optional PATTERN."""
         files = os.listdir(os.curdir)
-        files = filter(self._isrcs, files)
+        files = list(filter(self._isrcs, files))
         if os.path.isdir('RCS'):
             files2 = os.listdir('RCS')
-            files2 = filter(self._isrcs, files2)
+            files2 = list(filter(self._isrcs, files2))
             files = files + files2
-        files = map(self.realname, files)
+        files = list(map(self.realname, files))
         return self._filter(files, pat)
 
     def isvalid(self, name):
@@ -218,7 +218,7 @@
         line = f.readline()
         status = self._closepipe(f)
         if status:
-            raise IOError, status
+            raise IOError(status)
         if not line: return None
         if line[-1] == '\n':
             line = line[:-1]
@@ -232,7 +232,7 @@
         """
         name, rev = self._unmangle(name_rev)
         if not self.isvalid(name):
-            raise os.error, 'not an rcs file %r' % (name,)
+            raise os.error('not an rcs file %r' % (name,))
         return name, rev
 
     # --- Internal methods ---
@@ -269,7 +269,7 @@
             name, rev = name_rev
         for c in rev:
             if c not in self.okchars:
-                raise ValueError, "bad char in rev"
+                raise ValueError("bad char in rev")
         return name_rev
 
     def _closepipe(self, f):
@@ -304,7 +304,7 @@
         """
         cmd = cmd + " </dev/null"
         sts = os.system(cmd)
-        if sts: raise IOError, "command exit status %d" % sts
+        if sts: raise IOError("command exit status %d" % sts)
 
     def _filter(self, files, pat = None):
         """INTERNAL: Return a sorted copy of the given list of FILES.
@@ -316,7 +316,7 @@
         if pat:
             def keep(name, pat = pat):
                 return fnmatch.fnmatch(name, pat)
-            files = filter(keep, files)
+            files = list(filter(keep, files))
         else:
             files = files[:]
         files.sort()
diff --git a/Demo/pdist/rcvs.py b/Demo/pdist/rcvs.py
index ab1fd87..4e2532a 100755
--- a/Demo/pdist/rcvs.py
+++ b/Demo/pdist/rcvs.py
@@ -90,9 +90,9 @@
                     else: return 'r' # Get rid of entry
                 else: # not self.edeleted
                     if self.rsum:
-                        print "warning:",
-                        print self.file,
-                        print "was lost"
+                        print("warning:", end=' ')
+                        print(self.file, end=' ')
+                        print("was lost")
                         return 'U'
                     else: return 'r' # Get rid of entry
             else: # self.lsum
@@ -120,12 +120,12 @@
     def update(self):
         code = self.action()
         if code == '=': return
-        print code, self.file
+        print(code, self.file)
         if code in ('U', 'N'):
             self.get()
         elif code == 'C':
-            print "%s: conflict resolution not yet implemented" % \
-                  self.file
+            print("%s: conflict resolution not yet implemented" % \
+                  self.file)
         elif code == 'D':
             remove(self.file)
             self.eseen = 0
@@ -146,11 +146,11 @@
             self.put(message)
             return 1
         elif code == 'R':
-            print "%s: committing removes not yet implemented" % \
-                  self.file
+            print("%s: committing removes not yet implemented" % \
+                  self.file)
         elif code == 'C':
-            print "%s: conflict resolution not yet implemented" % \
-                  self.file
+            print("%s: conflict resolution not yet implemented" % \
+                  self.file)
 
     def diff(self, opts = []):
         self.action()           # To update lseen, rseen
@@ -174,22 +174,22 @@
         tf = tempfile.NamedTemporaryFile()
         tf.write(data)
         tf.flush()
-        print 'diff %s -r%s %s' % (flags, rev, fn)
+        print('diff %s -r%s %s' % (flags, rev, fn))
         sts = os.system('diff %s %s %s' % (flags, tf.name, fn))
         if sts:
-            print '='*70
+            print('='*70)
 
     def commitcheck(self):
         return self.action() != 'C'
 
     def put(self, message = ""):
-        print "Checking in", self.file, "..."
+        print("Checking in", self.file, "...")
         data = open(self.file).read()
         if not self.enew:
             self.proxy.lock(self.file)
         messages = self.proxy.put(self.file, data, message)
         if messages:
-            print messages
+            print(messages)
         self.setentry(self.proxy.head(self.file), self.lsum)
 
     def get(self):
@@ -200,7 +200,7 @@
         self.setentry(self.rrev, self.rsum)
 
     def log(self, otherflags):
-        print self.proxy.log(self.file, otherflags)
+        print(self.proxy.log(self.file, otherflags))
 
     def add(self):
         self.eseen = 0          # While we're hacking...
@@ -256,10 +256,10 @@
             if not e.commitcheck():
                 ok = 0
         if not ok:
-            print "correct above errors first"
+            print("correct above errors first")
             return
         if not message:
-            message = raw_input("One-liner: ")
+            message = input("One-liner: ")
         committed = []
         for e in list:
             if e.commit(message):
@@ -270,20 +270,20 @@
         towhom = "sjoerd@cwi.nl, jack@cwi.nl" # XXX
         mailtext = MAILFORM % (towhom, ' '.join(files),
                                 ' '.join(files), message)
-        print '-'*70
-        print mailtext
-        print '-'*70
-        ok = raw_input("OK to mail to %s? " % towhom)
+        print('-'*70)
+        print(mailtext)
+        print('-'*70)
+        ok = input("OK to mail to %s? " % towhom)
         if ok.lower().strip() in ('y', 'ye', 'yes'):
             p = os.popen(SENDMAIL, "w")
             p.write(mailtext)
             sts = p.close()
             if sts:
-                print "Sendmail exit status %s" % str(sts)
+                print("Sendmail exit status %s" % str(sts))
             else:
-                print "Mail sent."
+                print("Mail sent.")
         else:
-            print "No mail sent."
+            print("No mail sent.")
 
     def report(self, files):
         for e in self.whichentries(files):
@@ -295,15 +295,15 @@
 
     def add(self, files):
         if not files:
-            raise RuntimeError, "'cvs add' needs at least one file"
+            raise RuntimeError("'cvs add' needs at least one file")
         list = []
         for e in self.whichentries(files, 1):
             e.add()
 
     def rm(self, files):
         if not files:
-            raise RuntimeError, "'cvs rm' needs at least one file"
-        raise RuntimeError, "'cvs rm' not yet imlemented"
+            raise RuntimeError("'cvs rm' needs at least one file")
+        raise RuntimeError("'cvs rm' not yet imlemented")
 
     def log(self, files, opts):
         flags = ''
@@ -316,23 +316,23 @@
         if files:
             list = []
             for file in files:
-                if self.entries.has_key(file):
+                if file in self.entries:
                     e = self.entries[file]
                 else:
                     e = self.FileClass(file)
                     self.entries[file] = e
                 list.append(e)
         else:
-            list = self.entries.values()
+            list = list(self.entries.values())
             for file in self.proxy.listfiles():
-                if self.entries.has_key(file):
+                if file in self.entries:
                     continue
                 e = self.FileClass(file)
                 self.entries[file] = e
                 list.append(e)
             if localfilestoo:
                 for file in os.listdir(os.curdir):
-                    if not self.entries.has_key(file) \
+                    if file not in self.entries \
                        and not self.ignored(file):
                         e = self.FileClass(file)
                         self.entries[file] = e
@@ -376,7 +376,7 @@
                 continue
             if os.path.islink(name):
                 continue
-            print "--- entering subdirectory", name, "---"
+            print("--- entering subdirectory", name, "---")
             os.chdir(name)
             try:
                 if os.path.isdir("CVS"):
@@ -385,7 +385,7 @@
                     self.recurse()
             finally:
                 os.chdir(os.pardir)
-                print "--- left subdirectory", name, "---"
+                print("--- left subdirectory", name, "---")
 
     def options(self, opts):
         self.opts = opts
@@ -437,7 +437,7 @@
     def do_add(self, opts, files):
         """add file ..."""
         if not files:
-            print "'rcvs add' requires at least one file"
+            print("'rcvs add' requires at least one file")
             return
         self.cvs.add(files)
         self.cvs.putentries()
@@ -445,7 +445,7 @@
     def do_remove(self, opts, files):
         """remove file ..."""
         if not files:
-            print "'rcvs remove' requires at least one file"
+            print("'rcvs remove' requires at least one file")
             return
         self.cvs.remove(files)
         self.cvs.putentries()
diff --git a/Demo/pdist/rrcs.py b/Demo/pdist/rrcs.py
index 540d296..8d0ef03 100755
--- a/Demo/pdist/rrcs.py
+++ b/Demo/pdist/rrcs.py
@@ -18,22 +18,22 @@
             cmd = 'head'
         else:
             cmd, rest = rest[0], rest[1:]
-        if not commands.has_key(cmd):
-            raise getopt.error, "unknown command"
+        if cmd not in commands:
+            raise getopt.error("unknown command")
         coptset, func = commands[cmd]
         copts, files = getopt.getopt(rest, coptset)
     except getopt.error as msg:
-        print msg
-        print "usage: rrcs [options] command [options] [file] ..."
-        print "where command can be:"
-        print "      ci|put      # checkin the given files"
-        print "      co|get      # checkout"
-        print "      info        # print header info"
-        print "      head        # print revision of head branch"
-        print "      list        # list filename if valid"
-        print "      log         # print full log"
-        print "      diff        # diff rcs file and work file"
-        print "if no files are given, all remote rcs files are assumed"
+        print(msg)
+        print("usage: rrcs [options] command [options] [file] ...")
+        print("where command can be:")
+        print("      ci|put      # checkin the given files")
+        print("      co|get      # checkout")
+        print("      info        # print header info")
+        print("      head        # print revision of head branch")
+        print("      list        # list filename if valid")
+        print("      log         # print full log")
+        print("      diff        # diff rcs file and work file")
+        print("if no files are given, all remote rcs files are assumed")
         sys.exit(2)
     x = openrcsclient(opts)
     if not files:
@@ -42,7 +42,7 @@
         try:
             func(x, copts, fn)
         except (IOError, os.error) as msg:
-            print "%s: %s" % (fn, msg)
+            print("%s: %s" % (fn, msg))
 
 def checkin(x, copts, fn):
     f = open(fn)
@@ -50,13 +50,13 @@
     f.close()
     new = not x.isvalid(fn)
     if not new and same(x, copts, fn, data):
-        print "%s: unchanged since last checkin" % fn
+        print("%s: unchanged since last checkin" % fn)
         return
-    print "Checking in", fn, "..."
+    print("Checking in", fn, "...")
     message = asklogmessage(new)
     messages = x.put(fn, data, message)
     if messages:
-        print messages
+        print(messages)
 
 def checkout(x, copts, fn):
     data = x.get(fn)
@@ -72,19 +72,19 @@
 
 def info(x, copts, fn):
     dict = x.info(fn)
-    keys = dict.keys()
+    keys = list(dict.keys())
     keys.sort()
     for key in keys:
-        print key + ':', dict[key]
-    print '='*70
+        print(key + ':', dict[key])
+    print('='*70)
 
 def head(x, copts, fn):
     head = x.head(fn)
-    print fn, head
+    print(fn, head)
 
 def list(x, copts, fn):
     if x.isvalid(fn):
-        print fn
+        print(fn)
 
 def log(x, copts, fn):
     flags = ''
@@ -92,7 +92,7 @@
         flags = flags + ' ' + o + a
     flags = flags[1:]
     messages = x.log(fn, flags)
-    print messages
+    print(messages)
 
 def diff(x, copts, fn):
     if same(x, copts, fn):
@@ -105,10 +105,10 @@
     tf = tempfile.NamedTemporaryFile()
     tf.write(data)
     tf.flush()
-    print 'diff %s -r%s %s' % (flags, x.head(fn), fn)
+    print('diff %s -r%s %s' % (flags, x.head(fn), fn))
     sts = os.system('diff %s %s %s' % (flags, tf.name, fn))
     if sts:
-        print '='*70
+        print('='*70)
 
 def same(x, copts, fn, data = None):
     if data is None:
@@ -121,12 +121,12 @@
 
 def asklogmessage(new):
     if new:
-        print "enter description,",
+        print("enter description,", end=' ')
     else:
-        print "enter log message,",
-    print "terminate with single '.' or end of file:"
+        print("enter log message,", end=' ')
+    print("terminate with single '.' or end of file:")
     if new:
-        print "NOTE: This is NOT the log message!"
+        print("NOTE: This is NOT the log message!")
     message = ""
     while 1:
         sys.stderr.write(">> ")
diff --git a/Demo/pdist/security.py b/Demo/pdist/security.py
index b63081e..ffdbe2d 100755
--- a/Demo/pdist/security.py
+++ b/Demo/pdist/security.py
@@ -3,11 +3,11 @@
     def __init__(self):
         import os
         env = os.environ
-        if env.has_key('PYTHON_KEYFILE'):
+        if 'PYTHON_KEYFILE' in env:
             keyfile = env['PYTHON_KEYFILE']
         else:
             keyfile = '.python_keyfile'
-            if env.has_key('HOME'):
+            if 'HOME' in env:
                 keyfile = os.path.join(env['HOME'], keyfile)
             if not os.path.exists(keyfile):
                 import sys
@@ -19,7 +19,7 @@
         try:
             self._key = eval(open(keyfile).readline())
         except IOError:
-            raise IOError, "python keyfile %s: cannot open" % keyfile
+            raise IOError("python keyfile %s: cannot open" % keyfile)
 
     def _generate_challenge(self):
         import random
@@ -30,4 +30,4 @@
 
     def _encode_challenge(self, challenge):
         p, m = self._key
-        return pow(long(challenge), p, m)
+        return pow(int(challenge), p, m)
diff --git a/Demo/pdist/server.py b/Demo/pdist/server.py
index 79afa8b..98a4741 100755
--- a/Demo/pdist/server.py
+++ b/Demo/pdist/server.py
@@ -43,11 +43,11 @@
             self._serve()
 
     def _serve(self):
-        if self._verbose: print "Wait for connection ..."
+        if self._verbose: print("Wait for connection ...")
         conn, address = self._socket.accept()
-        if self._verbose: print "Accepted connection from %s" % repr(address)
+        if self._verbose: print("Accepted connection from %s" % repr(address))
         if not self._verify(conn, address):
-            print "*** Connection from %s refused" % repr(address)
+            print("*** Connection from %s refused" % repr(address))
             conn.close()
             return
         rf = conn.makefile('r')
@@ -55,7 +55,7 @@
         ok = 1
         while ok:
             wf.flush()
-            if self._verbose > 1: print "Wait for next request ..."
+            if self._verbose > 1: print("Wait for next request ...")
             ok = self._dorequest(rf, wf)
 
     _valid = ['192.16.201.*', '192.16.197.*', '132.151.1.*', '129.6.64.*']
@@ -72,22 +72,22 @@
             request = rp.load()
         except EOFError:
             return 0
-        if self._verbose > 1: print "Got request: %s" % repr(request)
+        if self._verbose > 1: print("Got request: %s" % repr(request))
         try:
             methodname, args, id = request
             if '.' in methodname:
                 reply = (None, self._special(methodname, args), id)
             elif methodname[0] == '_':
-                raise NameError, "illegal method name %s" % repr(methodname)
+                raise NameError("illegal method name %s" % repr(methodname))
             else:
                 method = getattr(self, methodname)
                 reply = (None, method(*args), id)
         except:
             reply = (sys.exc_info()[:2], id)
         if id < 0 and reply[:2] == (None, None):
-            if self._verbose > 1: print "Suppress reply"
+            if self._verbose > 1: print("Suppress reply")
             return 1
-        if self._verbose > 1: print "Send reply: %s" % repr(reply)
+        if self._verbose > 1: print("Send reply: %s" % repr(reply))
         wp = pickle.Pickler(wf)
         wp.dump(reply)
         return 1
@@ -97,16 +97,16 @@
             if not hasattr(self, '_methods'):
                 self._methods = tuple(self._listmethods())
             return self._methods
-        raise NameError, "unrecognized special method name %s" % repr(methodname)
+        raise NameError("unrecognized special method name %s" % repr(methodname))
 
     def _listmethods(self, cl=None):
         if not cl: cl = self.__class__
-        names = cl.__dict__.keys()
-        names = filter(lambda x: x[0] != '_', names)
+        names = list(cl.__dict__.keys())
+        names = [x for x in names if x[0] != '_']
         names.sort()
         for base in cl.__bases__:
             basenames = self._listmethods(base)
-            basenames = filter(lambda x, names=names: x not in names, basenames)
+            basenames = list(filter(lambda x, names=names: x not in names, basenames))
             names[len(names):] = basenames
         return names
 
@@ -134,12 +134,12 @@
             response = string.atol(string.strip(response))
         except string.atol_error:
             if self._verbose > 0:
-                print "Invalid response syntax", repr(response)
+                print("Invalid response syntax", repr(response))
             return 0
         if not self._compare_challenge_response(challenge, response):
             if self._verbose > 0:
-                print "Invalid response value", repr(response)
+                print("Invalid response value", repr(response))
             return 0
         if self._verbose > 1:
-            print "Response matches challenge.  Go ahead!"
+            print("Response matches challenge.  Go ahead!")
         return 1
diff --git a/Demo/pdist/sumtree.py b/Demo/pdist/sumtree.py
index 68224df..92e7771 100755
--- a/Demo/pdist/sumtree.py
+++ b/Demo/pdist/sumtree.py
@@ -9,13 +9,13 @@
     sumtree(proxy)
     proxy._close()
     t2 = time.time()
-    print t2-t1, "seconds"
+    print(t2-t1, "seconds")
     sys.stdout.write("[Return to exit] ")
     sys.stdout.flush()
     sys.stdin.readline()
 
 def sumtree(proxy):
-    print "PWD =", proxy.pwd()
+    print("PWD =", proxy.pwd())
     files = proxy.listfiles()
     proxy.infolist(files)
     subdirs = proxy.listsubdirs()
diff --git a/Demo/pysvr/pysvr.py b/Demo/pysvr/pysvr.py
index b1b7565..b200fad 100755
--- a/Demo/pysvr/pysvr.py
+++ b/Demo/pysvr/pysvr.py
@@ -20,7 +20,7 @@
     try:
         opts, args = getopt.getopt(sys.argv[1:], "")
         if len(args) > 1:
-            raise getopt.error, "Too many arguments."
+            raise getopt.error("Too many arguments.")
     except getopt.error as msg:
         usage(msg)
     for o, a in opts:
@@ -37,32 +37,32 @@
 def usage(msg=None):
     sys.stdout = sys.stderr
     if msg:
-        print msg
-    print "\n", __doc__,
+        print(msg)
+    print("\n", __doc__, end=' ')
     sys.exit(2)
 
 def main_thread(port):
     sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
     sock.bind(("", port))
     sock.listen(5)
-    print "Listening on port", port, "..."
+    print("Listening on port", port, "...")
     while 1:
         (conn, addr) = sock.accept()
         if addr[0] != conn.getsockname()[0]:
             conn.close()
-            print "Refusing connection from non-local host", addr[0], "."
+            print("Refusing connection from non-local host", addr[0], ".")
             continue
         thread.start_new_thread(service_thread, (conn, addr))
         del conn, addr
 
 def service_thread(conn, addr):
     (caddr, cport) = addr
-    print "Thread %s has connection from %s.\n" % (str(thread.get_ident()),
-                                                   caddr),
+    print("Thread %s has connection from %s.\n" % (str(thread.get_ident()),
+                                                   caddr), end=' ')
     stdin = conn.makefile("r")
     stdout = conn.makefile("w", 0)
     run_interpreter(stdin, stdout)
-    print "Thread %s is done.\n" % str(thread.get_ident()),
+    print("Thread %s is done.\n" % str(thread.get_ident()), end=' ')
 
 def run_interpreter(stdin, stdout):
     globals = {}
@@ -110,7 +110,7 @@
         try:
             exec(code, globals)
         except SystemExit as how:
-            raise SystemExit, how, sys.exc_info()[2]
+            raise SystemExit(how).with_traceback(sys.exc_info()[2])
         except:
             type, value, tb = sys.exc_info()
             if tb: tb = tb.tb_next
diff --git a/Demo/rpc/mountclient.py b/Demo/rpc/mountclient.py
index 318a9d9..3bb88b1 100644
--- a/Demo/rpc/mountclient.py
+++ b/Demo/rpc/mountclient.py
@@ -193,10 +193,10 @@
     mcl = C(host)
     list = mcl.Export()
     for item in list:
-        print item
+        print(item)
         try:
             mcl.Mnt(item[0])
         except:
-            print 'Sorry'
+            print('Sorry')
             continue
         mcl.Umnt(item[0])
diff --git a/Demo/rpc/nfsclient.py b/Demo/rpc/nfsclient.py
index 3890aff..aad8cf3 100644
--- a/Demo/rpc/nfsclient.py
+++ b/Demo/rpc/nfsclient.py
@@ -187,14 +187,14 @@
     if filesys == None:
         list = mcl.Export()
         for item in list:
-            print item
+            print(item)
         return
     sf = mcl.Mnt(filesys)
-    print sf
+    print(sf)
     fh = sf[1]
     if fh:
         ncl = NFSClient(host)
-        print ncl.Getattr(fh)
+        print(ncl.Getattr(fh))
         list = ncl.Listdir(fh)
-        for item in list: print item
+        for item in list: print(item)
         mcl.Umnt(filesys)
diff --git a/Demo/rpc/rnusersclient.py b/Demo/rpc/rnusersclient.py
index 1f3a882..eaabefe 100644
--- a/Demo/rpc/rnusersclient.py
+++ b/Demo/rpc/rnusersclient.py
@@ -77,19 +77,19 @@
         line = strip0(line)
         name = strip0(name)
         host = strip0(host)
-        print "%r %r %r %s %s" % (name, host, line, time, idle)
+        print("%r %r %r %s %s" % (name, host, line, time, idle))
 
 def testbcast():
     c = BroadcastRnusersClient('<broadcast>')
     def listit(list, fromaddr):
         host, port = fromaddr
-        print host + '\t:',
+        print(host + '\t:', end=' ')
         for (line, name, host, time), idle in list:
-            print strip0(name),
-        print
+            print(strip0(name), end=' ')
+        print()
     c.set_reply_handler(listit)
     all = c.Names()
-    print 'Total Count:', len(all)
+    print('Total Count:', len(all))
 
 def strip0(s):
     while s and s[-1] == '\0': s = s[:-1]
diff --git a/Demo/rpc/rpc.py b/Demo/rpc/rpc.py
index f7231c1..99115d3 100644
--- a/Demo/rpc/rpc.py
+++ b/Demo/rpc/rpc.py
@@ -95,10 +95,10 @@
         xid = self.unpack_uint()
         temp = self.unpack_enum()
         if temp != CALL:
-            raise BadRPCFormat, 'no CALL but %r' % (temp,)
+            raise BadRPCFormat('no CALL but %r' % (temp,))
         temp = self.unpack_uint()
         if temp != RPCVERSION:
-            raise BadRPCVersion, 'bad RPC version %r' % (temp,)
+            raise BadRPCVersion('bad RPC version %r' % (temp,))
         prog = self.unpack_uint()
         vers = self.unpack_uint()
         proc = self.unpack_uint()
@@ -111,38 +111,34 @@
         xid = self.unpack_uint()
         mtype = self.unpack_enum()
         if mtype != REPLY:
-            raise RuntimeError, 'no REPLY but %r' % (mtype,)
+            raise RuntimeError('no REPLY but %r' % (mtype,))
         stat = self.unpack_enum()
         if stat == MSG_DENIED:
             stat = self.unpack_enum()
             if stat == RPC_MISMATCH:
                 low = self.unpack_uint()
                 high = self.unpack_uint()
-                raise RuntimeError, \
-                  'MSG_DENIED: RPC_MISMATCH: %r' % ((low, high),)
+                raise RuntimeError('MSG_DENIED: RPC_MISMATCH: %r' % ((low, high),))
             if stat == AUTH_ERROR:
                 stat = self.unpack_uint()
-                raise RuntimeError, \
-                        'MSG_DENIED: AUTH_ERROR: %r' % (stat,)
-            raise RuntimeError, 'MSG_DENIED: %r' % (stat,)
+                raise RuntimeError('MSG_DENIED: AUTH_ERROR: %r' % (stat,))
+            raise RuntimeError('MSG_DENIED: %r' % (stat,))
         if stat != MSG_ACCEPTED:
-            raise RuntimeError, \
-              'Neither MSG_DENIED nor MSG_ACCEPTED: %r' % (stat,)
+            raise RuntimeError('Neither MSG_DENIED nor MSG_ACCEPTED: %r' % (stat,))
         verf = self.unpack_auth()
         stat = self.unpack_enum()
         if stat == PROG_UNAVAIL:
-            raise RuntimeError, 'call failed: PROG_UNAVAIL'
+            raise RuntimeError('call failed: PROG_UNAVAIL')
         if stat == PROG_MISMATCH:
             low = self.unpack_uint()
             high = self.unpack_uint()
-            raise RuntimeError, \
-                    'call failed: PROG_MISMATCH: %r' % ((low, high),)
+            raise RuntimeError('call failed: PROG_MISMATCH: %r' % ((low, high),))
         if stat == PROC_UNAVAIL:
-            raise RuntimeError, 'call failed: PROC_UNAVAIL'
+            raise RuntimeError('call failed: PROC_UNAVAIL')
         if stat == GARBAGE_ARGS:
-            raise RuntimeError, 'call failed: GARBAGE_ARGS'
+            raise RuntimeError('call failed: GARBAGE_ARGS')
         if stat != SUCCESS:
-            raise RuntimeError, 'call failed: %r' % (stat,)
+            raise RuntimeError('call failed: %r' % (stat,))
         return xid, verf
         # Caller must get procedure-specific part of reply
 
@@ -193,7 +189,7 @@
     offset, hh = divmod(hh + offset, 24)
     d = d + offset
     _unix_epoch = time.mktime((y, m, d, hh, mm, ss, 0, 0, 0))
-    print "Unix epoch:", time.ctime(_unix_epoch)
+    print("Unix epoch:", time.ctime(_unix_epoch))
     return _unix_epoch
 
 
@@ -219,7 +215,7 @@
 
     def makesocket(self):
         # This MUST be overridden
-        raise RuntimeError, 'makesocket not defined'
+        raise RuntimeError('makesocket not defined')
 
     def connsocket(self):
         # Override this if you don't want/need a connection
@@ -237,7 +233,7 @@
     def make_call(self, proc, args, pack_func, unpack_func):
         # Don't normally override this (but see Broadcast)
         if pack_func is None and args is not None:
-            raise TypeError, 'non-null args with null pack_func'
+            raise TypeError('non-null args with null pack_func')
         self.start_call(proc)
         if pack_func:
             pack_func(args)
@@ -260,7 +256,7 @@
 
     def do_call(self):
         # This MUST be overridden
-        raise RuntimeError, 'do_call not defined'
+        raise RuntimeError('do_call not defined')
 
     def mkcred(self):
         # Override this to use more powerful credentials
@@ -282,7 +278,7 @@
 
 def sendfrag(sock, last, frag):
     x = len(frag)
-    if last: x = x | 0x80000000L
+    if last: x = x | 0x80000000
     header = (chr(int(x>>24 & 0xff)) + chr(int(x>>16 & 0xff)) + \
               chr(int(x>>8 & 0xff)) + chr(int(x & 0xff)))
     sock.send(header + frag)
@@ -294,7 +290,7 @@
     header = sock.recv(4)
     if len(header) < 4:
         raise EOFError
-    x = long(ord(header[0]))<<24 | ord(header[1])<<16 | \
+    x = int(ord(header[0]))<<24 | ord(header[1])<<16 | \
         ord(header[2])<<8 | ord(header[3])
     last = ((x & 0x80000000) != 0)
     n = int(x & 0x7fffffff)
@@ -333,8 +329,8 @@
         except socket.error as e:
             (errno, msg) = e
             if errno != 114:
-                raise socket.error, (errno, msg)
-    raise RuntimeError, 'can\'t assign reserved port'
+                raise socket.error(errno, msg)
+    raise RuntimeError('can\'t assign reserved port')
 
 
 # Client using TCP to a specific port
@@ -353,8 +349,8 @@
         xid, verf = u.unpack_replyheader()
         if xid != self.lastxid:
             # Can't really happen since this is TCP...
-            raise RuntimeError, 'wrong xid in reply %r instead of %r' % (
-                                 xid, self.lastxid)
+            raise RuntimeError('wrong xid in reply %r instead of %r' % (
+                                 xid, self.lastxid))
 
 
 # Client using UDP to a specific port
@@ -370,7 +366,7 @@
         try:
             from select import select
         except ImportError:
-            print 'WARNING: select not found, RPC may hang'
+            print('WARNING: select not found, RPC may hang')
             select = None
         BUFSIZE = 8192 # Max UDP buffer size
         timeout = 1
@@ -381,7 +377,7 @@
                 r, w, x = select(r, w, x, timeout)
             if self.sock not in r:
                 count = count - 1
-                if count < 0: raise RuntimeError, 'timeout'
+                if count < 0: raise RuntimeError('timeout')
                 if timeout < 25: timeout = timeout *2
 ##                              print 'RESEND', timeout, count
                 self.sock.send(call)
@@ -417,7 +413,7 @@
 
     def make_call(self, proc, args, pack_func, unpack_func):
         if pack_func is None and args is not None:
-            raise TypeError, 'non-null args with null pack_func'
+            raise TypeError('non-null args with null pack_func')
         self.start_call(proc)
         if pack_func:
             pack_func(args)
@@ -426,7 +422,7 @@
         try:
             from select import select
         except ImportError:
-            print 'WARNING: select not found, broadcast will hang'
+            print('WARNING: select not found, broadcast will hang')
             select = None
         BUFSIZE = 8192 # Max UDP buffer size (for reply)
         replies = []
@@ -585,7 +581,7 @@
         port = pmap.Getport((prog, vers, IPPROTO_TCP, 0))
         pmap.close()
         if port == 0:
-            raise RuntimeError, 'program not registered'
+            raise RuntimeError('program not registered')
         RawTCPClient.__init__(self, host, prog, vers, port)
 
 
@@ -596,7 +592,7 @@
         port = pmap.Getport((prog, vers, IPPROTO_UDP, 0))
         pmap.close()
         if port == 0:
-            raise RuntimeError, 'program not registered'
+            raise RuntimeError('program not registered')
         RawUDPClient.__init__(self, host, prog, vers, port)
 
 
@@ -665,13 +661,13 @@
         mapping = self.prog, self.vers, self.prot, self.port
         p = TCPPortMapperClient(self.host)
         if not p.Set(mapping):
-            raise RuntimeError, 'register failed'
+            raise RuntimeError('register failed')
 
     def unregister(self):
         mapping = self.prog, self.vers, self.prot, self.port
         p = TCPPortMapperClient(self.host)
         if not p.Unset(mapping):
-            raise RuntimeError, 'unregister failed'
+            raise RuntimeError('unregister failed')
 
     def handle(self, call):
         # Don't use unpack_header but parse the header piecewise
@@ -736,7 +732,7 @@
 
     def makesocket(self):
         # This MUST be overridden
-        raise RuntimeError, 'makesocket not defined'
+        raise RuntimeError('makesocket not defined')
 
     def bindsocket(self):
         # Override this to bind to a different port (e.g. reserved)
@@ -767,7 +763,7 @@
             except EOFError:
                 break
             except socket.error as msg:
-                print 'socket error:', msg
+                print('socket error:', msg)
                 break
             reply = self.handle(call)
             if reply is not None:
@@ -826,11 +822,11 @@
     list = pmap.Dump()
     list.sort()
     for prog, vers, prot, port in list:
-        print prog, vers,
-        if prot == IPPROTO_TCP: print 'tcp',
-        elif prot == IPPROTO_UDP: print 'udp',
-        else: print prot,
-        print port
+        print(prog, vers, end=' ')
+        if prot == IPPROTO_TCP: print('tcp', end=' ')
+        elif prot == IPPROTO_UDP: print('udp', end=' ')
+        else: print(prot, end=' ')
+        print(port)
 
 
 # Test program for broadcast operation -- dump everybody's portmapper status
@@ -843,7 +839,7 @@
         bcastaddr = '<broadcast>'
     def rh(reply, fromaddr):
         host, port = fromaddr
-        print host + '\t' + repr(reply)
+        print(host + '\t' + repr(reply))
     pmap = BroadcastUDPPortMapperClient(bcastaddr)
     pmap.set_reply_handler(rh)
     pmap.set_timeout(5)
@@ -861,21 +857,21 @@
         def handle_1(self):
             arg = self.unpacker.unpack_string()
             self.turn_around()
-            print 'RPC function 1 called, arg', repr(arg)
+            print('RPC function 1 called, arg', repr(arg))
             self.packer.pack_string(arg + arg)
     #
     s = S('', 0x20000000, 1, 0)
     try:
         s.unregister()
     except RuntimeError as msg:
-        print 'RuntimeError:', msg, '(ignored)'
+        print('RuntimeError:', msg, '(ignored)')
     s.register()
-    print 'Service started...'
+    print('Service started...')
     try:
         s.loop()
     finally:
         s.unregister()
-        print 'Service interrupted.'
+        print('Service interrupted.')
 
 
 def testclt():
@@ -889,6 +885,6 @@
                     self.packer.pack_string, \
                     self.unpacker.unpack_string)
     c = C(host, 0x20000000, 1)
-    print 'making call...'
+    print('making call...')
     reply = c.call_1('hello, world, ')
-    print 'call returned', repr(reply)
+    print('call returned', repr(reply))
diff --git a/Demo/rpc/xdr.py b/Demo/rpc/xdr.py
index e03b352..fd9efee 100644
--- a/Demo/rpc/xdr.py
+++ b/Demo/rpc/xdr.py
@@ -7,7 +7,7 @@
     struct = None
 
 
-Long = type(0L)
+Long = type(0)
 
 
 class Packer:
@@ -28,8 +28,8 @@
     if struct and struct.pack('l', 1) == '\0\0\0\1':
         def pack_uint(self, x):
             if type(x) == Long:
-                x = int((x + 0x80000000L) % 0x100000000L \
-                           - 0x80000000L)
+                x = int((x + 0x80000000) % 0x100000000 \
+                           - 0x80000000)
             self.buf = self.buf + struct.pack('l', x)
 
     pack_int = pack_uint
@@ -56,7 +56,7 @@
 
     def pack_fstring(self, n, s):
         if n < 0:
-            raise ValueError, 'fstring size must be nonnegative'
+            raise ValueError('fstring size must be nonnegative')
         n = ((n+3)/4)*4
         data = s[:n]
         data = data + (n - len(data)) * '\0'
@@ -79,7 +79,7 @@
 
     def pack_farray(self, n, list, pack_item):
         if len(list) != n:
-            raise ValueError, 'wrong array size'
+            raise ValueError('wrong array size')
         for item in list:
             pack_item(item)
 
@@ -100,7 +100,7 @@
 
     def done(self):
         if self.pos < len(self.buf):
-            raise RuntimeError, 'unextracted data remains'
+            raise RuntimeError('unextracted data remains')
 
     def unpack_uint(self):
         i = self.pos
@@ -108,11 +108,11 @@
         data = self.buf[i:j]
         if len(data) < 4:
             raise EOFError
-        x = long(ord(data[0]))<<24 | ord(data[1])<<16 | \
+        x = int(ord(data[0]))<<24 | ord(data[1])<<16 | \
                 ord(data[2])<<8 | ord(data[3])
         # Return a Python long only if the value is not representable
         # as a nonnegative Python int
-        if x < 0x80000000L: x = int(x)
+        if x < 0x80000000: x = int(x)
         return x
     if struct and struct.unpack('l', '\0\0\0\1') == 1:
         def unpack_uint(self):
@@ -125,7 +125,7 @@
 
     def unpack_int(self):
         x = self.unpack_uint()
-        if x >= 0x80000000L: x = x - 0x100000000L
+        if x >= 0x80000000: x = x - 0x100000000
         return int(x)
 
     unpack_enum = unpack_int
@@ -135,11 +135,11 @@
     def unpack_uhyper(self):
         hi = self.unpack_uint()
         lo = self.unpack_uint()
-        return long(hi)<<32 | lo
+        return int(hi)<<32 | lo
 
     def unpack_hyper(self):
         x = self.unpack_uhyper()
-        if x >= 0x8000000000000000L: x = x - 0x10000000000000000L
+        if x >= 0x8000000000000000: x = x - 0x10000000000000000
         return x
 
     def unpack_float(self):
@@ -162,7 +162,7 @@
 
     def unpack_fstring(self, n):
         if n < 0:
-            raise ValueError, 'fstring size must be nonnegative'
+            raise ValueError('fstring size must be nonnegative')
         i = self.pos
         j = i + (n+3)/4*4
         if j > len(self.buf):
@@ -184,7 +184,7 @@
             x = self.unpack_uint()
             if x == 0: break
             if x != 1:
-                raise RuntimeError, '0 or 1 expected, got %r' % (x, )
+                raise RuntimeError('0 or 1 expected, got %r' % (x, ))
             item = unpack_item()
             list.append(item)
         return list
diff --git a/Demo/scripts/beer.py b/Demo/scripts/beer.py
index 1b9ac8b..f050572 100644
--- a/Demo/scripts/beer.py
+++ b/Demo/scripts/beer.py
@@ -8,7 +8,7 @@
     if n == 1: return "one bottle of beer"
     return str(n) + " bottles of beer"
 for i in range(n):
-    print bottle(n-i), "on the wall,"
-    print bottle(n-i) + "."
-    print "Take one down, pass it around,"
-    print bottle(n-i-1), "on the wall."
+    print(bottle(n-i), "on the wall,")
+    print(bottle(n-i) + ".")
+    print("Take one down, pass it around,")
+    print(bottle(n-i-1), "on the wall.")
diff --git a/Demo/scripts/eqfix.py b/Demo/scripts/eqfix.py
index 497ab20..47c00d3 100755
--- a/Demo/scripts/eqfix.py
+++ b/Demo/scripts/eqfix.py
@@ -143,7 +143,7 @@
     # First copy the file's mode to the temp file
     try:
         statbuf = os.stat(filename)
-        os.chmod(tempname, statbuf[ST_MODE] & 07777)
+        os.chmod(tempname, statbuf[ST_MODE] & 0o7777)
     except os.error as msg:
         err('%s: warning: chmod failed (%r)\n' % (tempname, msg))
     # Then make a backup of the original file as filename~
@@ -176,22 +176,22 @@
         j = tokenprog.match(line, i)
         if j < 0:
             # A bad token; forget about the rest of this line
-            print '(Syntax error:)'
-            print line,
+            print('(Syntax error:)')
+            print(line, end=' ')
             return line
         a, b = tokenprog.regs[3] # Location of the token proper
         token = line[a:b]
         i = i+j
         if stack and token == stack[-1]:
             del stack[-1]
-        elif match.has_key(token):
+        elif token in match:
             stack.append(match[token])
         elif token == '=' and stack:
             line = line[:a] + '==' + line[b:]
             i, n = a + len('=='), len(line)
         elif token == '==' and not stack:
-            print '(Warning: \'==\' at top level:)'
-            print line,
+            print('(Warning: \'==\' at top level:)')
+            print(line, end=' ')
     return line
 
 if __name__ == "__main__":
diff --git a/Demo/scripts/fact.py b/Demo/scripts/fact.py
index 03cab8b..19d28eb 100755
--- a/Demo/scripts/fact.py
+++ b/Demo/scripts/fact.py
@@ -36,12 +36,12 @@
     if len(sys.argv) > 1:
         for arg in sys.argv[1:]:
             n = eval(arg)
-            print n, fact(n)
+            print(n, fact(n))
     else:
         try:
             while 1:
-                n = input()
-                print n, fact(n)
+                n = eval(input())
+                print(n, fact(n))
         except EOFError:
             pass
 
diff --git a/Demo/scripts/find-uname.py b/Demo/scripts/find-uname.py
index b76b9f0..fbf4033 100644
--- a/Demo/scripts/find-uname.py
+++ b/Demo/scripts/find-uname.py
@@ -24,7 +24,7 @@
     unicode_names= []
     for ix in range(sys.maxunicode+1):
         try:
-            unicode_names.append( (ix, unicodedata.name(unichr(ix))) )
+            unicode_names.append( (ix, unicodedata.name(chr(ix))) )
         except ValueError: # no name for the character
             pass
     for arg in args:
@@ -32,9 +32,9 @@
         matches = [(x,y) for (x,y) in unicode_names
                        if pat.search(y) is not None]
         if matches:
-            print "***", arg, "matches", "***"
+            print("***", arg, "matches", "***")
             for (x,y) in matches:
-                print "%s (%d)" % (y,x)
+                print("%s (%d)" % (y,x))
 
 if __name__ == "__main__":
     main(sys.argv[1:])
diff --git a/Demo/scripts/from.py b/Demo/scripts/from.py
index 3c04fcd..323e684 100755
--- a/Demo/scripts/from.py
+++ b/Demo/scripts/from.py
@@ -25,11 +25,11 @@
         break # EOF
     if line.startswith('From '):
         # Start of message found
-        print line[:-1],
+        print(line[:-1], end=' ')
         while 1:
             line = mail.readline()
             if not line or line == '\n':
                 break
             if line.startswith('Subject: '):
-                print repr(line[9:-1]),
-        print
+                print(repr(line[9:-1]), end=' ')
+        print()
diff --git a/Demo/scripts/ftpstats.py b/Demo/scripts/ftpstats.py
index c7c0749..d0a0824 100755
--- a/Demo/scripts/ftpstats.py
+++ b/Demo/scripts/ftpstats.py
@@ -26,8 +26,8 @@
     try:
         opts, args = getopt.getopt(sys.argv[1:], 'm:s:')
     except getopt.error as msg:
-        print msg
-        print 'usage: ftpstats [-m maxitems] [file]'
+        print(msg)
+        print('usage: ftpstats [-m maxitems] [file]')
         sys.exit(2)
     for o, a in opts:
         if o == '-m':
@@ -42,7 +42,7 @@
         try:
             f = open(file, 'r')
         except IOError as msg:
-            print file, ':', msg
+            print(file, ':', msg)
             sys.exit(1)
     bydate = {}
     bytime = {}
@@ -60,7 +60,7 @@
             if search and string.find(line, search) < 0:
                 continue
             if prog.match(line) < 0:
-                print 'Bad line', lineno, ':', repr(line)
+                print('Bad line', lineno, ':', repr(line))
                 continue
             items = prog.group(1, 2, 3, 4, 5, 6)
             (logtime, loguser, loghost, logfile, logbytes,
@@ -93,7 +93,7 @@
             add(byuser, loguser, items)
             add(bytype, direction, items)
     except KeyboardInterrupt:
-        print 'Interrupted at line', lineno
+        print('Interrupted at line', lineno)
     show(bytype, 'by transfer direction', maxitems)
     show(bydir, 'by directory', maxitems)
     show(byfile, 'by file', maxitems)
@@ -104,9 +104,9 @@
 
 def showbar(dict, title):
     n = len(title)
-    print '='*((70-n)/2), title, '='*((71-n)/2)
+    print('='*((70-n)/2), title, '='*((71-n)/2))
     list = []
-    keys = dict.keys()
+    keys = list(dict.keys())
     keys.sort()
     for key in keys:
         n = len(str(key))
@@ -120,23 +120,23 @@
     for count, key in list:
         barlength = int(round(maxbarlength*float(count)/maxcount))
         bar = '*'*barlength
-        print '%5d %-*s %s' % (count, maxkeylength, key, bar)
+        print('%5d %-*s %s' % (count, maxkeylength, key, bar))
 
 def show(dict, title, maxitems):
     if len(dict) > maxitems:
         title = title + ' (first %d)'%maxitems
     n = len(title)
-    print '='*((70-n)/2), title, '='*((71-n)/2)
+    print('='*((70-n)/2), title, '='*((71-n)/2))
     list = []
-    keys = dict.keys()
+    keys = list(dict.keys())
     for key in keys:
         list.append((-len(dict[key]), key))
     list.sort()
     for count, key in list[:maxitems]:
-        print '%5d %s' % (-count, key)
+        print('%5d %s' % (-count, key))
 
 def add(dict, key, item):
-    if dict.has_key(key):
+    if key in dict:
         dict[key].append(item)
     else:
         dict[key] = [item]
diff --git a/Demo/scripts/lpwatch.py b/Demo/scripts/lpwatch.py
index c3dcb34..567385c 100755
--- a/Demo/scripts/lpwatch.py
+++ b/Demo/scripts/lpwatch.py
@@ -25,7 +25,7 @@
             if printers[i][:2] == '-P':
                 printers[i] = printers[i][2:]
     else:
-        if posix.environ.has_key('PRINTER'):
+        if 'PRINTER' in posix.environ:
             printers = [posix.environ['PRINTER']]
         else:
             printers = [DEF_PRINTER]
@@ -36,7 +36,7 @@
         text = clearhome
         for name in printers:
             text = text + makestatus(name, thisuser) + '\n'
-        print text
+        print(text)
         time.sleep(delay)
 
 def makestatus(name, thisuser):
@@ -66,7 +66,7 @@
                 aheadjobs = aheadjobs + 1
             totalbytes = totalbytes + bytes
             totaljobs = totaljobs + 1
-            if users.has_key(user):
+            if user in users:
                 ujobs, ubytes = users[user]
             else:
                 ujobs, ubytes = 0, 0
@@ -87,7 +87,7 @@
         if totaljobs != len(users):
             line = line + ' (%d jobs)' % totaljobs
         if len(users) == 1:
-            line = line + ' for %s' % (users.keys()[0],)
+            line = line + ' for %s' % (list(users.keys())[0],)
         else:
             line = line + ' for %d users' % len(users)
             if userseen:
diff --git a/Demo/scripts/makedir.py b/Demo/scripts/makedir.py
index f70facd..7095868 100755
--- a/Demo/scripts/makedir.py
+++ b/Demo/scripts/makedir.py
@@ -15,7 +15,7 @@
     if p and not os.path.isdir(p):
         head, tail = os.path.split(p)
         makedirs(head)
-        os.mkdir(p, 0777)
+        os.mkdir(p, 0o777)
 
 if __name__ == "__main__":
     main()
diff --git a/Demo/scripts/markov.py b/Demo/scripts/markov.py
index bddec56..a91e359 100755
--- a/Demo/scripts/markov.py
+++ b/Demo/scripts/markov.py
@@ -6,7 +6,7 @@
         self.choice = choice
         self.trans = {}
     def add(self, state, next):
-        if not self.trans.has_key(state):
+        if state not in self.trans:
             self.trans[state] = [next]
         else:
             self.trans[state].append(next)
@@ -36,19 +36,19 @@
     try:
         opts, args = getopt.getopt(args, '0123456789cdw')
     except getopt.error:
-        print 'Usage: markov [-#] [-cddqw] [file] ...'
-        print 'Options:'
-        print '-#: 1-digit history size (default 2)'
-        print '-c: characters (default)'
-        print '-w: words'
-        print '-d: more debugging output'
-        print '-q: no debugging output'
-        print 'Input files (default stdin) are split in paragraphs'
-        print 'separated blank lines and each paragraph is split'
-        print 'in words by whitespace, then reconcatenated with'
-        print 'exactly one space separating words.'
-        print 'Output consists of paragraphs separated by blank'
-        print 'lines, where lines are no longer than 72 characters.'
+        print('Usage: markov [-#] [-cddqw] [file] ...')
+        print('Options:')
+        print('-#: 1-digit history size (default 2)')
+        print('-c: characters (default)')
+        print('-w: words')
+        print('-d: more debugging output')
+        print('-q: no debugging output')
+        print('Input files (default stdin) are split in paragraphs')
+        print('separated blank lines and each paragraph is split')
+        print('in words by whitespace, then reconcatenated with')
+        print('exactly one space separating words.')
+        print('Output consists of paragraphs separated by blank')
+        print('lines, where lines are no longer than 72 characters.')
     histsize = 2
     do_words = 0
     debug = 1
@@ -65,33 +65,33 @@
             if filename == '-':
                 f = sys.stdin
                 if f.isatty():
-                    print 'Sorry, need stdin from file'
+                    print('Sorry, need stdin from file')
                     continue
             else:
                 f = open(filename, 'r')
-            if debug: print 'processing', filename, '...'
+            if debug: print('processing', filename, '...')
             text = f.read()
             f.close()
             paralist = string.splitfields(text, '\n\n')
             for para in paralist:
-                if debug > 1: print 'feeding ...'
+                if debug > 1: print('feeding ...')
                 words = string.split(para)
                 if words:
                     if do_words: data = tuple(words)
                     else: data = string.joinfields(words, ' ')
                     m.put(data)
     except KeyboardInterrupt:
-        print 'Interrupted -- continue with data read so far'
+        print('Interrupted -- continue with data read so far')
     if not m.trans:
-        print 'No valid input files'
+        print('No valid input files')
         return
-    if debug: print 'done.'
+    if debug: print('done.')
     if debug > 1:
-        for key in m.trans.keys():
+        for key in list(m.trans.keys()):
             if key is None or len(key) < histsize:
-                print repr(key), m.trans[key]
-        if histsize == 0: print repr(''), m.trans['']
-        print
+                print(repr(key), m.trans[key])
+        if histsize == 0: print(repr(''), m.trans[''])
+        print()
     while 1:
         data = m.get()
         if do_words: words = data
@@ -100,12 +100,12 @@
         limit = 72
         for w in words:
             if n + len(w) > limit:
-                print
+                print()
                 n = 0
-            print w,
+            print(w, end=' ')
             n = n + len(w) + 1
-        print
-        print
+        print()
+        print()
 
 def tuple(list):
     if len(list) == 0: return ()
diff --git a/Demo/scripts/mboxconvert.py b/Demo/scripts/mboxconvert.py
index 8da37bf..787c760 100755
--- a/Demo/scripts/mboxconvert.py
+++ b/Demo/scripts/mboxconvert.py
@@ -91,19 +91,19 @@
         sys.stderr.write(
                 'Unparseable date: %r\n' % (m.getheader('Date'),))
         t = os.fstat(f.fileno())[stat.ST_MTIME]
-    print 'From', email, time.ctime(t)
+    print('From', email, time.ctime(t))
     # Copy RFC822 header
     for line in m.headers:
-        print line,
+        print(line, end=' ')
     # Invent Message-ID header if none is present
-    if not m.has_key('message-id'):
+    if 'message-id' not in m:
         global counter
         counter = counter + 1
         msgid = "<%s.%d>" % (hex(t), counter)
         sys.stderr.write("Adding Message-ID %s (From %s)\n" %
                          (msgid, email))
-        print "Message-ID:", msgid
-    print
+        print("Message-ID:", msgid)
+    print()
     # Copy body
     while 1:
         line = f.readline()
@@ -115,9 +115,9 @@
             break
         if line[:5] == 'From ':
             line = '>' + line
-        print line,
+        print(line, end=' ')
     # Print trailing newline
-    print
+    print()
     return sts
 
 if __name__ == "__main__":
diff --git a/Demo/scripts/mkrcs.py b/Demo/scripts/mkrcs.py
index cacdda0..317647a 100755
--- a/Demo/scripts/mkrcs.py
+++ b/Demo/scripts/mkrcs.py
@@ -12,13 +12,13 @@
     rcstree = 'RCStree'
     rcs = 'RCS'
     if os.path.islink(rcs):
-        print '%r is a symlink to %r' % (rcs, os.readlink(rcs))
+        print('%r is a symlink to %r' % (rcs, os.readlink(rcs)))
         return
     if os.path.isdir(rcs):
-        print '%r is an ordinary directory' % (rcs,)
+        print('%r is an ordinary directory' % (rcs,))
         return
     if os.path.exists(rcs):
-        print '%r is a file?!?!' % (rcs,)
+        print('%r is a file?!?!' % (rcs,))
         return
     #
     p = os.getcwd()
@@ -34,7 +34,7 @@
         head, tail = os.path.split(p)
         #print 'head = %r; tail = %r' % (head, tail)
         if not tail:
-            print 'Sorry, no ancestor dir contains %r' % (rcstree,)
+            print('Sorry, no ancestor dir contains %r' % (rcstree,))
             return
         p = head
         up = os.path.join(os.pardir, up)
@@ -44,18 +44,18 @@
     there = os.path.join(there, down)
     there = os.path.join(there, rcs)
     if os.path.isdir(there):
-        print '%r already exists' % (there, )
+        print('%r already exists' % (there, ))
     else:
-        print 'making %r' % (there,)
+        print('making %r' % (there,))
         makedirs(there)
-    print 'making symlink %r -> %r' % (rcs, there)
+    print('making symlink %r -> %r' % (rcs, there))
     os.symlink(there, rcs)
 
 def makedirs(p):
     if not os.path.isdir(p):
         head, tail = os.path.split(p)
         makedirs(head)
-        os.mkdir(p, 0777)
+        os.mkdir(p, 0o777)
 
 if __name__ == "__main__":
     main()
diff --git a/Demo/scripts/newslist.py b/Demo/scripts/newslist.py
index 0111ace..4635f1d 100755
--- a/Demo/scripts/newslist.py
+++ b/Demo/scripts/newslist.py
@@ -98,7 +98,7 @@
 for dir in os.curdir, os.environ['HOME']:
     rcfile = os.path.join(dir, '.newslistrc.py')
     if os.path.exists(rcfile):
-        print rcfile
+        print(rcfile)
         execfile(rcfile)
         break
 
@@ -106,7 +106,7 @@
 from stat import *
 
 rcsrev = '$Revision$'
-rcsrev = string.join(filter(lambda s: '$' not in s, string.split(rcsrev)))
+rcsrev = string.join([s for s in string.split(rcsrev) if '$' not in s])
 desc = {}
 
 # Make (possibly) relative filenames into absolute ones
@@ -118,7 +118,7 @@
 
 # Addtotree creates/augments a tree from a list of group names
 def addtotree(tree, groups):
-    print 'Updating tree...'
+    print('Updating tree...')
     for i in groups:
         parts = string.splitfields(i,'.')
         makeleaf(tree, parts)
@@ -128,7 +128,7 @@
     j = path[0]
     l = len(path)
 
-    if not tree.has_key(j):
+    if j not in tree:
         tree[j] = {}
     if l == 1:
         tree[j]['.'] = '.'
@@ -172,7 +172,7 @@
         createpage(p[1:], tree, p)
         return
 
-    kl = tree.keys()
+    kl = list(tree.keys())
 
     if l > 1:
         kl.sort()
@@ -188,7 +188,7 @@
         if i == '.':
             # Output a newsgroup
             f.write('<LI><A HREF="news:' + p[1:] + '">'+ p[1:] + '</A> ')
-            if desc.has_key(p[1:]):
+            if p[1:] in desc:
                 f.write('     <I>'+desc[p[1:]]+'</I>\n')
             else:
                 f.write('\n')
@@ -213,9 +213,9 @@
 
     try:
         d = open(descfile, 'r')
-        print 'Reading descriptions...'
+        print('Reading descriptions...')
     except (IOError):
-        print 'Failed to open description file ' + descfile
+        print('Failed to open description file ' + descfile)
         return
     l = d.readline()
     while l != '':
@@ -234,29 +234,29 @@
 
 def checkopdir(pagedir):
     if not os.path.isdir(pagedir):
-        print 'Directory '+pagedir+' does not exist.'
-        print 'Shall I create it for you? (y/n)'
+        print('Directory '+pagedir+' does not exist.')
+        print('Shall I create it for you? (y/n)')
         if sys.stdin.readline()[0] == 'y':
             try:
-                os.mkdir(pagedir,0777)
+                os.mkdir(pagedir,0o777)
             except:
-                print 'Sorry - failed!'
+                print('Sorry - failed!')
                 sys.exit(1)
         else:
-            print 'OK. Exiting.'
+            print('OK. Exiting.')
             sys.exit(1)
 
 # Read and write current local tree ----------------------------------
 
 def readlocallist(treefile):
-    print 'Reading current local group list...'
+    print('Reading current local group list...')
     tree = {}
     try:
         treetime = time.localtime(os.stat(treefile)[ST_MTIME])
     except:
-        print '\n*** Failed to open local group cache '+treefile
-        print 'If this is the first time you have run newslist, then'
-        print 'use the -a option to create it.'
+        print('\n*** Failed to open local group cache '+treefile)
+        print('If this is the first time you have run newslist, then')
+        print('use the -a option to create it.')
         sys.exit(1)
     treedate = '%02d%02d%02d' % (treetime[0] % 100 ,treetime[1], treetime[2])
     try:
@@ -264,7 +264,7 @@
         tree = marshal.load(dump)
         dump.close()
     except (IOError):
-        print 'Cannot open local group list ' + treefile
+        print('Cannot open local group list ' + treefile)
     return (tree, treedate)
 
 def writelocallist(treefile, tree):
@@ -272,45 +272,45 @@
         dump = open(treefile,'w')
         groups = marshal.dump(tree,dump)
         dump.close()
-        print 'Saved list to '+treefile+'\n'
+        print('Saved list to '+treefile+'\n')
     except:
-        print 'Sorry - failed to write to local group cache '+treefile
-        print 'Does it (or its directory) have the correct permissions?'
+        print('Sorry - failed to write to local group cache '+treefile)
+        print('Does it (or its directory) have the correct permissions?')
         sys.exit(1)
 
 # Return list of all groups on server -----------------------------
 
 def getallgroups(server):
-    print 'Getting list of all groups...'
+    print('Getting list of all groups...')
     treedate='010101'
     info = server.list()[1]
     groups = []
-    print 'Processing...'
+    print('Processing...')
     if skipempty:
-        print '\nIgnoring following empty groups:'
+        print('\nIgnoring following empty groups:')
     for i in info:
         grpname = string.split(i[0])[0]
         if skipempty and string.atoi(i[1]) < string.atoi(i[2]):
-            print grpname+' ',
+            print(grpname+' ', end=' ')
         else:
             groups.append(grpname)
-    print '\n'
+    print('\n')
     if skipempty:
-        print '(End of empty groups)'
+        print('(End of empty groups)')
     return groups
 
 # Return list of new groups on server -----------------------------
 
 def getnewgroups(server, treedate):
-    print 'Getting list of new groups since start of '+treedate+'...',
+    print('Getting list of new groups since start of '+treedate+'...', end=' ')
     info = server.newgroups(treedate,'000001')[1]
-    print 'got %d.' % len(info)
-    print 'Processing...',
+    print('got %d.' % len(info))
+    print('Processing...', end=' ')
     groups = []
     for i in info:
         grpname = string.split(i)[0]
         groups.append(grpname)
-    print 'Done'
+    print('Done')
     return groups
 
 # Now the main program --------------------------------------------
@@ -324,15 +324,15 @@
     checkopdir(pagedir);
 
     try:
-        print 'Connecting to '+newshost+'...'
+        print('Connecting to '+newshost+'...')
         if sys.version[0] == '0':
             s = NNTP.init(newshost)
         else:
             s = NNTP(newshost)
         connected = 1
     except (nntplib.error_temp, nntplib.error_perm) as x:
-        print 'Error connecting to host:', x
-        print 'I\'ll try to use just the local list.'
+        print('Error connecting to host:', x)
+        print('I\'ll try to use just the local list.')
         connected = 0
 
     # If -a is specified, read the full list of groups from server
@@ -355,9 +355,9 @@
     # Read group descriptions
     readdesc(descfile)
 
-    print 'Creating pages...'
+    print('Creating pages...')
     createpage(rootpage, tree, '')
-    print 'Done'
+    print('Done')
 
 if __name__ == "__main__":
     main()
diff --git a/Demo/scripts/pi.py b/Demo/scripts/pi.py
index 9b24245..a360e40 100755
--- a/Demo/scripts/pi.py
+++ b/Demo/scripts/pi.py
@@ -11,16 +11,16 @@
 import sys
 
 def main():
-    k, a, b, a1, b1 = 2L, 4L, 1L, 12L, 4L
+    k, a, b, a1, b1 = 2, 4, 1, 12, 4
     while 1:
         # Next approximation
-        p, q, k = k*k, 2L*k+1L, k+1L
+        p, q, k = k*k, 2*k+1, k+1
         a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
         # Print common digits
         d, d1 = a/b, a1/b1
         while d == d1:
             output(d)
-            a, a1 = 10L*(a%b), 10L*(a1%b1)
+            a, a1 = 10*(a%b), 10*(a1%b1)
             d, d1 = a/b, a1/b1
 
 def output(d):
diff --git a/Demo/scripts/pp.py b/Demo/scripts/pp.py
index 2530ea3..486986a 100755
--- a/Demo/scripts/pp.py
+++ b/Demo/scripts/pp.py
@@ -58,7 +58,7 @@
         NFLAG = 1
         PFLAG = 1
     else:
-        print option, 'not recognized???'
+        print(option, 'not recognized???')
 
 if not ARGS: ARGS.append('-')
 
diff --git a/Demo/scripts/primes.py b/Demo/scripts/primes.py
index 8762fe2..0924aab 100755
--- a/Demo/scripts/primes.py
+++ b/Demo/scripts/primes.py
@@ -12,7 +12,7 @@
     primes(min, max)
 
 def primes(min, max):
-    if 2 >= min: print 2
+    if 2 >= min: print(2)
     primes = [2]
     i = 3
     while i <= max:
@@ -20,7 +20,7 @@
             if i%p == 0 or p*p > i: break
         if i%p != 0:
             primes.append(i)
-            if i >= min: print i
+            if i >= min: print(i)
         i = i+2
 
 if __name__ == "__main__":
diff --git a/Demo/scripts/queens.py b/Demo/scripts/queens.py
index 74756be..820c9ad 100755
--- a/Demo/scripts/queens.py
+++ b/Demo/scripts/queens.py
@@ -56,16 +56,16 @@
         self.nfound = self.nfound + 1
         if self.silent:
             return
-        print '+-' + '--'*self.n + '+'
+        print('+-' + '--'*self.n + '+')
         for y in range(self.n-1, -1, -1):
-            print '|',
+            print('|', end=' ')
             for x in range(self.n):
                 if self.y[x] == y:
-                    print "Q",
+                    print("Q", end=' ')
                 else:
-                    print ".",
-            print '|'
-        print '+-' + '--'*self.n + '+'
+                    print(".", end=' ')
+            print('|')
+        print('+-' + '--'*self.n + '+')
 
 def main():
     import sys
@@ -79,7 +79,7 @@
     q = Queens(n)
     q.silent = silent
     q.solve()
-    print "Found", q.nfound, "solutions."
+    print("Found", q.nfound, "solutions.")
 
 if __name__ == "__main__":
     main()
diff --git a/Demo/scripts/script.py b/Demo/scripts/script.py
index 6eaa7ae..174c13e 100755
--- a/Demo/scripts/script.py
+++ b/Demo/scripts/script.py
@@ -17,7 +17,7 @@
 shell = 'sh'
 filename = 'typescript'
 mode = 'w'
-if os.environ.has_key('SHELL'):
+if 'SHELL' in os.environ:
     shell = os.environ['SHELL']
 if '-a' in sys.argv:
     mode = 'a'
diff --git a/Demo/scripts/unbirthday.py b/Demo/scripts/unbirthday.py
index 94ad448..5c39092 100755
--- a/Demo/scripts/unbirthday.py
+++ b/Demo/scripts/unbirthday.py
@@ -21,69 +21,70 @@
     if sys.argv[1:]:
         year = int(sys.argv[1])
     else:
-        year = int(raw_input('In which year were you born? '))
+        year = int(input('In which year were you born? '))
     if 0<=year<100:
-        print "I'll assume that by", year,
+        print("I'll assume that by", year, end=' ')
         year = year + 1900
-        print 'you mean', year, 'and not the early Christian era'
+        print('you mean', year, 'and not the early Christian era')
     elif not (1850<=year<=2002):
-        print "It's hard to believe you were born in", year
+        print("It's hard to believe you were born in", year)
         return
     #
     if sys.argv[2:]:
         month = int(sys.argv[2])
     else:
-        month = int(raw_input('And in which month? (1-12) '))
+        month = int(input('And in which month? (1-12) '))
     if not (1<=month<=12):
-        print 'There is no month numbered', month
+        print('There is no month numbered', month)
         return
     #
     if sys.argv[3:]:
         day = int(sys.argv[3])
     else:
-        day = int(raw_input('And on what day of that month? (1-31) '))
+        day = int(input('And on what day of that month? (1-31) '))
     if month == 2 and calendar.isleap(year):
         maxday = 29
     else:
         maxday = calendar.mdays[month]
     if not (1<=day<=maxday):
-        print 'There are no', day, 'days in that month!'
+        print('There are no', day, 'days in that month!')
         return
     #
     bdaytuple = (year, month, day)
     bdaydate = mkdate(bdaytuple)
-    print 'You were born on', format(bdaytuple)
+    print('You were born on', format(bdaytuple))
     #
     todaytuple = time.localtime()[:3]
     todaydate = mkdate(todaytuple)
-    print 'Today is', format(todaytuple)
+    print('Today is', format(todaytuple))
     #
     if bdaytuple > todaytuple:
-        print 'You are a time traveler.  Go back to the future!'
+        print('You are a time traveler.  Go back to the future!')
         return
     #
     if bdaytuple == todaytuple:
-        print 'You were born today.  Have a nice life!'
+        print('You were born today.  Have a nice life!')
         return
     #
     days = todaydate - bdaydate
-    print 'You have lived', days, 'days'
+    print('You have lived', days, 'days')
     #
     age = 0
     for y in range(year, todaytuple[0] + 1):
         if bdaytuple < (y, month, day) <= todaytuple:
             age = age + 1
     #
-    print 'You are', age, 'years old'
+    print('You are', age, 'years old')
     #
     if todaytuple[1:] == bdaytuple[1:]:
-        print 'Congratulations!  Today is your', nth(age), 'birthday'
-        print 'Yesterday was your',
+        print('Congratulations!  Today is your', nth(age), 'birthday')
+        print('Yesterday was your', end=' ')
     else:
-        print 'Today is your',
-    print nth(days - age), 'unbirthday'
+        print('Today is your', end=' ')
+    print(nth(days - age), 'unbirthday')
 
-def format((year, month, day)):
+def format(xxx_todo_changeme):
+    (year, month, day) = xxx_todo_changeme
     return '%d %s %d' % (day, calendar.month_name[month], year)
 
 def nth(n):
@@ -92,10 +93,11 @@
     if n == 3: return '3rd'
     return '%dth' % n
 
-def mkdate((year, month, day)):
+def mkdate(xxx_todo_changeme1):
     # Januari 1st, in 0 A.D. is arbitrarily defined to be day 1,
     # even though that day never actually existed and the calendar
     # was different then...
+    (year, month, day) = xxx_todo_changeme1
     days = year*365                 # years, roughly
     days = days + (year+3)/4        # plus leap years, roughly
     days = days - (year+99)/100     # minus non-leap years every century
diff --git a/Demo/scripts/update.py b/Demo/scripts/update.py
index a965e4a..d49e4b3 100755
--- a/Demo/scripts/update.py
+++ b/Demo/scripts/update.py
@@ -20,22 +20,22 @@
         try:
             self.lines = open(filename, 'r').readlines()
         except IOError as msg:
-            print '*** Can\'t open "%s":' % filename, msg
+            print('*** Can\'t open "%s":' % filename, msg)
             self.lines = None
             return
-        print 'diffing', self.filename
+        print('diffing', self.filename)
 
     def finish(self):
         if not self.changed:
-            print 'no changes to', self.filename
+            print('no changes to', self.filename)
             return
         try:
             os.rename(self.filename, self.filename + '~')
             fp = open(self.filename, 'w')
         except (os.error, IOError) as msg:
-            print '*** Can\'t rewrite "%s":' % self.filename, msg
+            print('*** Can\'t rewrite "%s":' % self.filename, msg)
             return
-        print 'writing', self.filename
+        print('writing', self.filename)
         for line in self.lines:
             fp.write(line)
         fp.close()
@@ -43,32 +43,32 @@
 
     def process(self, lineno, rest):
         if self.lines is None:
-            print '(not processed): %s:%s:%s' % (
-                      self.filename, lineno, rest),
+            print('(not processed): %s:%s:%s' % (
+                      self.filename, lineno, rest), end=' ')
             return
         i = eval(lineno) - 1
         if not 0 <= i < len(self.lines):
-            print '*** Line number out of range: %s:%s:%s' % (
-                      self.filename, lineno, rest),
+            print('*** Line number out of range: %s:%s:%s' % (
+                      self.filename, lineno, rest), end=' ')
             return
         if self.lines[i] == rest:
-            print '(no change): %s:%s:%s' % (
-                      self.filename, lineno, rest),
+            print('(no change): %s:%s:%s' % (
+                      self.filename, lineno, rest), end=' ')
             return
         if not self.changed:
             self.changed = 1
-        print '%sc%s' % (lineno, lineno)
-        print '<', self.lines[i],
-        print '---'
+        print('%sc%s' % (lineno, lineno))
+        print('<', self.lines[i], end=' ')
+        print('---')
         self.lines[i] = rest
-        print '>', self.lines[i],
+        print('>', self.lines[i], end=' ')
 
 def main():
     if sys.argv[1:]:
         try:
             fp = open(sys.argv[1], 'r')
         except IOError as msg:
-            print 'Can\'t open "%s":' % sys.argv[1], msg
+            print('Can\'t open "%s":' % sys.argv[1], msg)
             sys.exit(1)
     else:
         fp = sys.stdin
@@ -80,7 +80,7 @@
             break
         n = prog.match(line)
         if n < 0:
-            print 'Funny line:', line,
+            print('Funny line:', line, end=' ')
             continue
         filename, lineno = prog.group(1, 2)
         if not curfile or filename != curfile.filename:
diff --git a/Demo/sockets/echosvr.py b/Demo/sockets/echosvr.py
index f8a9623..7de6391 100755
--- a/Demo/sockets/echosvr.py
+++ b/Demo/sockets/echosvr.py
@@ -21,7 +21,7 @@
     s.bind(('', port))
     s.listen(1)
     conn, (remotehost, remoteport) = s.accept()
-    print 'connected by', remotehost, remoteport
+    print('connected by', remotehost, remoteport)
     while 1:
         data = conn.recv(BUFSIZE)
         if not data:
diff --git a/Demo/sockets/ftp.py b/Demo/sockets/ftp.py
index eed45be..9f9f1dc 100755
--- a/Demo/sockets/ftp.py
+++ b/Demo/sockets/ftp.py
@@ -107,13 +107,13 @@
 def getreply(f):
     line = f.readline()
     if not line: return 'EOF'
-    print line,
+    print(line, end=' ')
     code = line[:3]
     if line[3:4] == '-':
         while 1:
             line = f.readline()
             if not line: break # Really an error
-            print line,
+            print(line, end=' ')
             if line[:3] == code and line[3:4] != '-': break
     return code
 
@@ -121,14 +121,14 @@
 # Get the data from the data connection.
 #
 def getdata(r):
-    print '(accepting data connection)'
+    print('(accepting data connection)')
     conn, host = r.accept()
-    print '(data connection accepted)'
+    print('(data connection accepted)')
     while 1:
         data = conn.recv(BUFSIZE)
         if not data: break
         sys.stdout.write(data)
-    print '(end of data connection)'
+    print('(end of data connection)')
 
 def raw_input(prompt):
     sys.stdout.write(prompt)
@@ -140,7 +140,7 @@
 def getcommand():
     try:
         while 1:
-            line = raw_input('ftp.py> ')
+            line = input('ftp.py> ')
             if line: return line
     except EOFError:
         return ''
diff --git a/Demo/sockets/gopher.py b/Demo/sockets/gopher.py
index 0635ac1..c287319 100755
--- a/Demo/sockets/gopher.py
+++ b/Demo/sockets/gopher.py
@@ -60,7 +60,7 @@
     while 1:
         line = f.readline()
         if not line:
-            print '(Unexpected EOF from server)'
+            print('(Unexpected EOF from server)')
             break
         if line[-2:] == CRLF:
             line = line[:-2]
@@ -69,15 +69,15 @@
         if line == '.':
             break
         if not line:
-            print '(Empty line from server)'
+            print('(Empty line from server)')
             continue
         typechar = line[0]
         parts = line[1:].split(TAB)
         if len(parts) < 4:
-            print '(Bad line from server: %r)' % (line,)
+            print('(Bad line from server: %r)' % (line,))
             continue
         if len(parts) > 4:
-            print '(Extra info from server: %r)' % (parts[4:],)
+            print('(Extra info from server: %r)' % (parts[4:],))
         parts.insert(0, typechar)
         list.append(parts)
     f.close()
@@ -95,7 +95,7 @@
     while 1:
         line = f.readline()
         if not line:
-            print '(Unexpected EOF from server)'
+            print('(Unexpected EOF from server)')
             break
         if line[-2:] == CRLF:
             line = line[:-2]
@@ -139,61 +139,61 @@
     if n > 2 and args[2]:
         port = args[2]
     if n > 3:
-        raise RuntimeError, 'too many args'
+        raise RuntimeError('too many args')
     try:
         browse_menu(selector, host, port)
     except socket.error as msg:
-        print 'Socket error:', msg
+        print('Socket error:', msg)
         sys.exit(1)
     except KeyboardInterrupt:
-        print '\n[Goodbye]'
+        print('\n[Goodbye]')
 
 # Browse a menu
 def browse_menu(selector, host, port):
     list = get_menu(selector, host, port)
     while 1:
-        print '----- MENU -----'
-        print 'Selector:', repr(selector)
-        print 'Host:', host, ' Port:', port
-        print
+        print('----- MENU -----')
+        print('Selector:', repr(selector))
+        print('Host:', host, ' Port:', port)
+        print()
         for i in range(len(list)):
             item = list[i]
             typechar, description = item[0], item[1]
-            print repr(i+1).rjust(3) + ':', description,
-            if typename.has_key(typechar):
-                print typename[typechar]
+            print(repr(i+1).rjust(3) + ':', description, end=' ')
+            if typechar in typename:
+                print(typename[typechar])
             else:
-                print '<TYPE=' + repr(typechar) + '>'
-        print
+                print('<TYPE=' + repr(typechar) + '>')
+        print()
         while 1:
             try:
-                str = raw_input('Choice [CR == up a level]: ')
+                str = input('Choice [CR == up a level]: ')
             except EOFError:
-                print
+                print()
                 return
             if not str:
                 return
             try:
                 choice = int(str)
             except ValueError:
-                print 'Choice must be a number; try again:'
+                print('Choice must be a number; try again:')
                 continue
             if not 0 < choice <= len(list):
-                print 'Choice out of range; try again:'
+                print('Choice out of range; try again:')
                 continue
             break
         item = list[choice-1]
         typechar = item[0]
         [i_selector, i_host, i_port] = item[2:5]
-        if typebrowser.has_key(typechar):
+        if typechar in typebrowser:
             browserfunc = typebrowser[typechar]
             try:
                 browserfunc(i_selector, i_host, i_port)
             except (IOError, socket.error):
                 t, v, tb = sys.exc_info()
-                print '***', t, ':', v
+                print('***', t, ':', v)
         else:
-            print 'Unsupported object type'
+            print('Unsupported object type')
 
 # Browse a text file
 def browse_textfile(selector, host, port):
@@ -203,7 +203,7 @@
         x = SaveLines(p)
         get_alt_textfile(selector, host, port, x.writeln)
     except IOError as msg:
-        print 'IOError:', msg
+        print('IOError:', msg)
     if x:
         x.close()
     f = open_savefile()
@@ -212,9 +212,9 @@
     x = SaveLines(f)
     try:
         get_alt_textfile(selector, host, port, x.writeln)
-        print 'Done.'
+        print('Done.')
     except IOError as msg:
-        print 'IOError:', msg
+        print('IOError:', msg)
     x.close()
 
 def raw_input(prompt):
@@ -225,32 +225,32 @@
 # Browse a search index
 def browse_search(selector, host, port):
     while 1:
-        print '----- SEARCH -----'
-        print 'Selector:', repr(selector)
-        print 'Host:', host, ' Port:', port
-        print
+        print('----- SEARCH -----')
+        print('Selector:', repr(selector))
+        print('Host:', host, ' Port:', port)
+        print()
         try:
-            query = raw_input('Query [CR == up a level]: ')
+            query = input('Query [CR == up a level]: ')
         except EOFError:
-            print
+            print()
             break
         query = query.strip()
         if not query:
             break
         if '\t' in query:
-            print 'Sorry, queries cannot contain tabs'
+            print('Sorry, queries cannot contain tabs')
             continue
         browse_menu(selector + TAB + query, host, port)
 
 # "Browse" telnet-based information, i.e. open a telnet session
 def browse_telnet(selector, host, port):
     if selector:
-        print 'Log in as', repr(selector)
+        print('Log in as', repr(selector))
     if type(port) != type(''):
         port = repr(port)
     sts = os.system('set -x; exec telnet ' + host + ' ' + port)
     if sts:
-        print 'Exit status:', sts
+        print('Exit status:', sts)
 
 # "Browse" a binary file, i.e. save it to a file
 def browse_binary(selector, host, port):
@@ -280,7 +280,7 @@
     def close(self):
         sts = self.f.close()
         if sts:
-            print 'Exit status:', sts
+            print('Exit status:', sts)
 
 # Class used to save data while showing progress
 class SaveWithProgress:
@@ -291,18 +291,18 @@
         sys.stdout.flush()
         self.f.write(data)
     def close(self):
-        print
+        print()
         sts = self.f.close()
         if sts:
-            print 'Exit status:', sts
+            print('Exit status:', sts)
 
 # Ask for and open a save file, or return None if not to save
 def open_savefile():
     try:
-        savefile = raw_input( \
+        savefile = input( \
     'Save as file [CR == don\'t save; |pipeline or ~user/... OK]: ')
     except EOFError:
-        print
+        print()
         return None
     savefile = savefile.strip()
     if not savefile:
@@ -312,24 +312,24 @@
         try:
             p = os.popen(cmd, 'w')
         except IOError as msg:
-            print repr(cmd), ':', msg
+            print(repr(cmd), ':', msg)
             return None
-        print 'Piping through', repr(cmd), '...'
+        print('Piping through', repr(cmd), '...')
         return p
     if savefile[0] == '~':
         savefile = os.path.expanduser(savefile)
     try:
         f = open(savefile, 'w')
     except IOError as msg:
-        print repr(savefile), ':', msg
+        print(repr(savefile), ':', msg)
         return None
-    print 'Saving to', repr(savefile), '...'
+    print('Saving to', repr(savefile), '...')
     return f
 
 # Test program
 def test():
     if sys.argv[4:]:
-        print 'usage: gopher [ [selector] host [port] ]'
+        print('usage: gopher [ [selector] host [port] ]')
         sys.exit(2)
     elif sys.argv[3:]:
         browser(sys.argv[1], sys.argv[2], sys.argv[3])
diff --git a/Demo/sockets/mcast.py b/Demo/sockets/mcast.py
index 1abd305..c1902d6 100755
--- a/Demo/sockets/mcast.py
+++ b/Demo/sockets/mcast.py
@@ -52,7 +52,7 @@
     while 1:
         data, sender = s.recvfrom(1500)
         while data[-1:] == '\0': data = data[:-1] # Strip trailing \0's
-        print sender, ':', repr(data)
+        print(sender, ':', repr(data))
 
 
 # Open a UDP socket, bind it to a port and select a multicast group
@@ -76,7 +76,7 @@
     group = gethostbyname(group)
     #
     # Construct binary group address
-    bytes = map(int, string.split(group, "."))
+    bytes = list(map(int, string.split(group, ".")))
     grpaddr = 0
     for byte in bytes: grpaddr = (grpaddr << 8) | byte
     #
diff --git a/Demo/sockets/rpython.py b/Demo/sockets/rpython.py
index 8333d39..b654dc2 100755
--- a/Demo/sockets/rpython.py
+++ b/Demo/sockets/rpython.py
@@ -12,7 +12,7 @@
 
 def main():
     if len(sys.argv) < 3:
-        print "usage: rpython host command"
+        print("usage: rpython host command")
         sys.exit(2)
     host = sys.argv[1]
     port = PORT
@@ -30,6 +30,6 @@
         data = s.recv(BUFSIZE)
         if not data: break
         reply = reply + data
-    print reply,
+    print(reply, end=' ')
 
 main()
diff --git a/Demo/sockets/rpythond.py b/Demo/sockets/rpythond.py
index 34de982..d745cc7 100755
--- a/Demo/sockets/rpythond.py
+++ b/Demo/sockets/rpythond.py
@@ -7,7 +7,7 @@
 
 import sys
 from socket import *
-import StringIO
+import io
 import traceback
 
 PORT = 4127
@@ -23,7 +23,7 @@
     s.listen(1)
     while 1:
         conn, (remotehost, remoteport) = s.accept()
-        print 'connected by', remotehost, remoteport
+        print('connected by', remotehost, remoteport)
         request = ''
         while 1:
             data = conn.recv(BUFSIZE)
@@ -37,12 +37,12 @@
 def execute(request):
     stdout = sys.stdout
     stderr = sys.stderr
-    sys.stdout = sys.stderr = fakefile = StringIO.StringIO()
+    sys.stdout = sys.stderr = fakefile = io.StringIO()
     try:
         try:
             exec(request, {}, {})
         except:
-            print
+            print()
             traceback.print_exc(100)
     finally:
         sys.stderr = stderr
diff --git a/Demo/sockets/telnet.py b/Demo/sockets/telnet.py
index 6bc9bcc..038036ff 100755
--- a/Demo/sockets/telnet.py
+++ b/Demo/sockets/telnet.py
@@ -77,7 +77,7 @@
             cleandata = ''
             for c in data:
                 if opt:
-                    print ord(c)
+                    print(ord(c))
                     s.send(opt + c)
                     opt = ''
                 elif iac:
@@ -85,18 +85,18 @@
                     if c == IAC:
                         cleandata = cleandata + c
                     elif c in (DO, DONT):
-                        if c == DO: print '(DO)',
-                        else: print '(DONT)',
+                        if c == DO: print('(DO)', end=' ')
+                        else: print('(DONT)', end=' ')
                         opt = IAC + WONT
                     elif c in (WILL, WONT):
-                        if c == WILL: print '(WILL)',
-                        else: print '(WONT)',
+                        if c == WILL: print('(WILL)', end=' ')
+                        else: print('(WONT)', end=' ')
                         opt = IAC + DONT
                     else:
-                        print '(command)', ord(c)
+                        print('(command)', ord(c))
                 elif c == IAC:
                     iac = 1
-                    print '(IAC)',
+                    print('(IAC)', end=' ')
                 else:
                     cleandata = cleandata + c
             sys.stdout.write(cleandata)
diff --git a/Demo/sockets/throughput.py b/Demo/sockets/throughput.py
index b8df1f3..64244aa 100755
--- a/Demo/sockets/throughput.py
+++ b/Demo/sockets/throughput.py
@@ -33,8 +33,8 @@
 
 def usage():
     sys.stdout = sys.stderr
-    print 'Usage:    (on host_A) throughput -s [port]'
-    print 'and then: (on host_B) throughput -c count host_A [port]'
+    print('Usage:    (on host_A) throughput -s [port]')
+    print('and then: (on host_B) throughput -c count host_A [port]')
     sys.exit(2)
 
 
@@ -46,7 +46,7 @@
     s = socket(AF_INET, SOCK_STREAM)
     s.bind(('', port))
     s.listen(1)
-    print 'Server ready...'
+    print('Server ready...')
     while 1:
         conn, (host, remoteport) = s.accept()
         while 1:
@@ -56,7 +56,7 @@
             del data
         conn.send('OK\n')
         conn.close()
-        print 'Done with', host, 'port', remoteport
+        print('Done with', host, 'port', remoteport)
 
 
 def client():
@@ -82,12 +82,12 @@
     t4 = time.time()
     data = s.recv(BUFSIZE)
     t5 = time.time()
-    print data
-    print 'Raw timers:', t1, t2, t3, t4, t5
-    print 'Intervals:', t2-t1, t3-t2, t4-t3, t5-t4
-    print 'Total:', t5-t1
-    print 'Throughput:', round((BUFSIZE*count*0.001) / (t5-t1), 3),
-    print 'K/sec.'
+    print(data)
+    print('Raw timers:', t1, t2, t3, t4, t5)
+    print('Intervals:', t2-t1, t3-t2, t4-t3, t5-t4)
+    print('Total:', t5-t1)
+    print('Throughput:', round((BUFSIZE*count*0.001) / (t5-t1), 3), end=' ')
+    print('K/sec.')
 
 
 main()
diff --git a/Demo/sockets/udpecho.py b/Demo/sockets/udpecho.py
index 5181c82..8a6bd21 100755
--- a/Demo/sockets/udpecho.py
+++ b/Demo/sockets/udpecho.py
@@ -23,8 +23,8 @@
 
 def usage():
     sys.stdout = sys.stderr
-    print 'Usage: udpecho -s [port]            (server)'
-    print 'or:    udpecho -c host [port] <file (client)'
+    print('Usage: udpecho -s [port]            (server)')
+    print('or:    udpecho -c host [port] <file (client)')
     sys.exit(2)
 
 def server():
@@ -34,10 +34,10 @@
         port = ECHO_PORT
     s = socket(AF_INET, SOCK_DGRAM)
     s.bind(('', port))
-    print 'udp echo server ready'
+    print('udp echo server ready')
     while 1:
         data, addr = s.recvfrom(BUFSIZE)
-        print 'server received %r from %r' % (data, addr)
+        print('server received %r from %r' % (data, addr))
         s.sendto(data, addr)
 
 def client():
@@ -51,13 +51,13 @@
     addr = host, port
     s = socket(AF_INET, SOCK_DGRAM)
     s.bind(('', 0))
-    print 'udp echo client ready, reading stdin'
+    print('udp echo client ready, reading stdin')
     while 1:
         line = sys.stdin.readline()
         if not line:
             break
         s.sendto(line, addr)
         data, fromaddr = s.recvfrom(BUFSIZE)
-        print 'client received %r from %r' % (data, fromaddr)
+        print('client received %r from %r' % (data, fromaddr))
 
 main()
diff --git a/Demo/sockets/unixclient.py b/Demo/sockets/unixclient.py
index fdbcc7a..cdccb84 100644
--- a/Demo/sockets/unixclient.py
+++ b/Demo/sockets/unixclient.py
@@ -9,4 +9,4 @@
 s.send('Hello, world')
 data = s.recv(1024)
 s.close()
-print 'Received', repr(data)
+print('Received', repr(data))
diff --git a/Demo/sockets/unixserver.py b/Demo/sockets/unixserver.py
index b73f857..c3c9c4f 100644
--- a/Demo/sockets/unixserver.py
+++ b/Demo/sockets/unixserver.py
@@ -8,7 +8,7 @@
 s = socket(AF_UNIX, SOCK_STREAM)
 s.bind(FILE)
 
-print 'Sock name is: ['+s.getsockname()+']'
+print('Sock name is: ['+s.getsockname()+']')
 
 # Wait for a connection
 s.listen(1)
diff --git a/Demo/threads/Coroutine.py b/Demo/threads/Coroutine.py
index 10fa303..6bf788b 100644
--- a/Demo/threads/Coroutine.py
+++ b/Demo/threads/Coroutine.py
@@ -78,7 +78,7 @@
         if self.f is None:
             return 'main coroutine'
         else:
-            return 'coroutine for func ' + self.f.func_name
+            return 'coroutine for func ' + self.f.__name__
 
     def __hash__(self):
         return id(self)
@@ -125,9 +125,9 @@
 
     def kill(self):
         if self.killed:
-            raise TypeError, 'kill() called on dead coroutines'
+            raise TypeError('kill() called on dead coroutines')
         self.killed = 1
-        for coroutine in self.invokedby.keys():
+        for coroutine in list(self.invokedby.keys()):
             coroutine.resume()
 
     def back(self, data=None):
@@ -137,10 +137,10 @@
         return self.tran( self.main, data )
 
     def tran(self, target, data=None):
-        if not self.invokedby.has_key(target):
-            raise TypeError, '.tran target %r is not an active coroutine' % (target,)
+        if target not in self.invokedby:
+            raise TypeError('.tran target %r is not an active coroutine' % (target,))
         if self.killed:
-            raise TypeError, '.tran target %r is killed' % (target,)
+            raise TypeError('.tran target %r is killed' % (target,))
         self.value = data
         me = self.active
         self.invokedby[target] = me
@@ -152,7 +152,7 @@
             if self.main is not me:
                 raise Killed
             if self.terminated_by is not None:
-                raise EarlyExit, '%r terminated early' % (self.terminated_by,)
+                raise EarlyExit('%r terminated early' % (self.terminated_by,))
 
         return self.value
 
diff --git a/Demo/threads/Generator.py b/Demo/threads/Generator.py
index 63bed9b..0cc1bda 100644
--- a/Demo/threads/Generator.py
+++ b/Demo/threads/Generator.py
@@ -32,7 +32,7 @@
     # Called by producer for each value; raise Killed if no more needed
     def put(self, value):
         if self.killed:
-            raise TypeError, 'put() called on killed generator'
+            raise TypeError('put() called on killed generator')
         self.value = value
         self.getlock.release()  # Resume consumer thread
         self.putlock.acquire()  # Wait for next get() call
@@ -41,7 +41,7 @@
     # Called by producer to get next value; raise EOFError if no more
     def get(self):
         if self.killed:
-            raise TypeError, 'get() called on killed generator'
+            raise TypeError('get() called on killed generator')
         self.putlock.release()  # Resume producer thread
         self.getlock.acquire()  # Wait for value to appear
         if self.done:
@@ -50,7 +50,7 @@
     # Called by consumer if no more values wanted
     def kill(self):
         if self.killed:
-            raise TypeError, 'kill() called on killed generator'
+            raise TypeError('kill() called on killed generator')
         self.killed = 1
         self.putlock.release()
     # Clone constructor
@@ -58,27 +58,27 @@
         return Generator(self.func, self.args)
 
 def pi(g):
-    k, a, b, a1, b1 = 2L, 4L, 1L, 12L, 4L
+    k, a, b, a1, b1 = 2, 4, 1, 12, 4
     while 1:
         # Next approximation
-        p, q, k = k*k, 2L*k+1L, k+1L
+        p, q, k = k*k, 2*k+1, k+1
         a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
         # Print common digits
         d, d1 = a/b, a1/b1
         while d == d1:
             g.put(int(d))
-            a, a1 = 10L*(a%b), 10L*(a1%b1)
+            a, a1 = 10*(a%b), 10*(a1%b1)
             d, d1 = a/b, a1/b1
 
 def test():
     g = Generator(pi, ())
     g.kill()
     g = Generator(pi, ())
-    for i in range(10): print g.get(),
-    print
+    for i in range(10): print(g.get(), end=' ')
+    print()
     h = g.clone()
     g.kill()
     while 1:
-        print h.get(),
+        print(h.get(), end=' ')
 
 test()
diff --git a/Demo/threads/fcmp.py b/Demo/threads/fcmp.py
index 27af76d..bc2e3ed 100644
--- a/Demo/threads/fcmp.py
+++ b/Demo/threads/fcmp.py
@@ -16,10 +16,10 @@
     f = co.create(fringe, co, list)
     try:
         while 1:
-            print co.tran(f),
+            print(co.tran(f), end=' ')
     except EarlyExit:
         pass
-    print
+    print()
 
 printinorder([1,2,3])  # 1 2 3
 printinorder([[[[1,[2]]],3]]) # ditto
@@ -49,16 +49,16 @@
             co1.kill(); co2.kill()
             return cmp(v1,v2)
 
-print fcmp(range(7), x)  #  0; fringes are equal
-print fcmp(range(6), x)  # -1; 1st list ends early
-print fcmp(x, range(6))  #  1; 2nd list ends early
-print fcmp(range(8), x)  #  1; 2nd list ends early
-print fcmp(x, range(8))  # -1; 1st list ends early
-print fcmp([1,[[2],8]],
-           [[[1],2],8])  #  0
-print fcmp([1,[[3],8]],
-           [[[1],2],8])  #  1
-print fcmp([1,[[2],8]],
-           [[[1],2],9])  # -1
+print(fcmp(range(7), x))  #  0; fringes are equal
+print(fcmp(range(6), x))  # -1; 1st list ends early
+print(fcmp(x, range(6)))  #  1; 2nd list ends early
+print(fcmp(range(8), x))  #  1; 2nd list ends early
+print(fcmp(x, range(8)))  # -1; 1st list ends early
+print(fcmp([1,[[2],8]],
+           [[[1],2],8]))  #  0
+print(fcmp([1,[[3],8]],
+           [[[1],2],8]))  #  1
+print(fcmp([1,[[2],8]],
+           [[[1],2],9]))  # -1
 
 # end of example
diff --git a/Demo/threads/find.py b/Demo/threads/find.py
index 68ca155..57fe81e 100644
--- a/Demo/threads/find.py
+++ b/Demo/threads/find.py
@@ -123,7 +123,7 @@
 
 def selector(dir, name, fullname, stat):
     # Look for world writable files that are not symlinks
-    return (stat[ST_MODE] & 0002) != 0 and not S_ISLNK(stat[ST_MODE])
+    return (stat[ST_MODE] & 0o002) != 0 and not S_ISLNK(stat[ST_MODE])
 
 
 # The find procedure -- calls wq.addwork() for subdirectories
@@ -132,7 +132,7 @@
     try:
         names = os.listdir(dir)
     except os.error as msg:
-        print repr(dir), ':', msg
+        print(repr(dir), ':', msg)
         return
     for name in names:
         if name not in (os.curdir, os.pardir):
@@ -140,10 +140,10 @@
             try:
                 stat = os.lstat(fullname)
             except os.error as msg:
-                print repr(fullname), ':', msg
+                print(repr(fullname), ':', msg)
                 continue
             if pred(dir, name, fullname, stat):
-                print fullname
+                print(fullname)
             if S_ISDIR(stat[ST_MODE]):
                 if not os.path.ismount(fullname):
                     wq.addwork(find, (fullname, pred, wq))
diff --git a/Demo/threads/squasher.py b/Demo/threads/squasher.py
index 0d59cb8..35b1b1d 100644
--- a/Demo/threads/squasher.py
+++ b/Demo/threads/squasher.py
@@ -89,7 +89,7 @@
 def putline():
     while 1:
         line = co.tran(coassembler)
-        print line
+        print(line)
 
 import string
 co = Coroutine()
@@ -100,6 +100,6 @@
 cosquasher = co.create(squasher)
 
 co.tran(coputline)
-print 'done'
+print('done')
 
 # end of example
diff --git a/Demo/threads/sync.py b/Demo/threads/sync.py
index 843767a..61e1628 100644
--- a/Demo/threads/sync.py
+++ b/Demo/threads/sync.py
@@ -280,8 +280,8 @@
                hasattr(lock, 'release'):
                 self.mutex = lock
             else:
-                raise TypeError, 'condition constructor requires ' \
-                                 'a lock argument'
+                raise TypeError('condition constructor requires ' \
+                                 'a lock argument')
 
         # lock used to block threads until a signal
         self.checkout = thread.allocate_lock()
@@ -304,8 +304,7 @@
     def wait(self):
         mutex, checkout, idlock = self.mutex, self.checkout, self.idlock
         if not mutex.locked():
-            raise ValueError, \
-                  "condition must be .acquire'd when .wait() invoked"
+            raise ValueError("condition must be .acquire'd when .wait() invoked")
 
         idlock.acquire()
         myid = self.id
@@ -336,7 +335,7 @@
 
     def broadcast(self, num = -1):
         if num < -1:
-            raise ValueError, '.broadcast called with num %r' % (num,)
+            raise ValueError('.broadcast called with num %r' % (num,))
         if num == 0:
             return
         self.idlock.acquire()
@@ -402,7 +401,7 @@
 class semaphore:
     def __init__(self, count=1):
         if count <= 0:
-            raise ValueError, 'semaphore count %d; must be >= 1' % count
+            raise ValueError('semaphore count %d; must be >= 1' % count)
         self.count = count
         self.maxcount = count
         self.nonzero = condition()
@@ -417,8 +416,8 @@
     def v(self):
         self.nonzero.acquire()
         if self.count == self.maxcount:
-            raise ValueError, '.v() tried to raise semaphore count above ' \
-                  'initial value %r' % self.maxcount
+            raise ValueError('.v() tried to raise semaphore count above ' \
+                  'initial value %r' % self.maxcount)
         self.count = self.count + 1
         self.nonzero.signal()
         self.nonzero.release()
@@ -445,8 +444,7 @@
     def read_out(self):
         self.rwOK.acquire()
         if self.nr <= 0:
-            raise ValueError, \
-                  '.read_out() invoked without an active reader'
+            raise ValueError('.read_out() invoked without an active reader')
         self.nr = self.nr - 1
         if self.nr == 0:
             self.writeOK.signal()
@@ -463,8 +461,7 @@
     def write_out(self):
         self.rwOK.acquire()
         if not self.writing:
-            raise ValueError, \
-                  '.write_out() invoked without an active writer'
+            raise ValueError('.write_out() invoked without an active writer')
         self.writing = 0
         self.nw = self.nw - 1
         if self.nw:
@@ -476,8 +473,7 @@
     def write_to_read(self):
         self.rwOK.acquire()
         if not self.writing:
-            raise ValueError, \
-                  '.write_to_read() invoked without an active writer'
+            raise ValueError('.write_to_read() invoked without an active writer')
         self.writing = 0
         self.nw = self.nw - 1
         self.nr = self.nr + 1
@@ -496,13 +492,13 @@
     global TID
     tid.acquire(); id = TID = TID+1; tid.release()
     io.acquire(); alive.append(id); \
-                  print 'starting thread', id, '--', len(alive), 'alive'; \
+                  print('starting thread', id, '--', len(alive), 'alive'); \
                   io.release()
     thread.start_new_thread( func, (id,) + args )
 
 def _qsort(tid, a, l, r, finished):
     # sort a[l:r]; post finished when done
-    io.acquire(); print 'thread', tid, 'qsort', l, r; io.release()
+    io.acquire(); print('thread', tid, 'qsort', l, r); io.release()
     if r-l > 1:
         pivot = a[l]
         j = l+1   # make a[l:j] <= pivot, and a[j:r] > pivot
@@ -519,44 +515,44 @@
         l_subarray_sorted.wait()
         r_subarray_sorted.wait()
 
-    io.acquire(); print 'thread', tid, 'qsort done'; \
+    io.acquire(); print('thread', tid, 'qsort done'); \
                   alive.remove(tid); io.release()
     finished.post()
 
 def _randarray(tid, a, finished):
-    io.acquire(); print 'thread', tid, 'randomizing array'; \
+    io.acquire(); print('thread', tid, 'randomizing array'); \
                   io.release()
     for i in range(1, len(a)):
         wh.acquire(); j = randint(0,i); wh.release()
         a[i], a[j] = a[j], a[i]
-    io.acquire(); print 'thread', tid, 'randomizing done'; \
+    io.acquire(); print('thread', tid, 'randomizing done'); \
                   alive.remove(tid); io.release()
     finished.post()
 
 def _check_sort(a):
     if a != range(len(a)):
-        raise ValueError, ('a not sorted', a)
+        raise ValueError('a not sorted', a)
 
 def _run_one_sort(tid, a, bar, done):
     # randomize a, and quicksort it
     # for variety, all the threads running this enter a barrier
     # at the end, and post `done' after the barrier exits
-    io.acquire(); print 'thread', tid, 'randomizing', a; \
+    io.acquire(); print('thread', tid, 'randomizing', a); \
                   io.release()
     finished = event()
     _new_thread(_randarray, a, finished)
     finished.wait()
 
-    io.acquire(); print 'thread', tid, 'sorting', a; io.release()
+    io.acquire(); print('thread', tid, 'sorting', a); io.release()
     finished.clear()
     _new_thread(_qsort, a, 0, len(a), finished)
     finished.wait()
     _check_sort(a)
 
-    io.acquire(); print 'thread', tid, 'entering barrier'; \
+    io.acquire(); print('thread', tid, 'entering barrier'); \
                   io.release()
     bar.enter()
-    io.acquire(); print 'thread', tid, 'leaving barrier'; \
+    io.acquire(); print('thread', tid, 'leaving barrier'); \
                   io.release()
     io.acquire(); alive.remove(tid); io.release()
     bar.enter() # make sure they've all removed themselves from alive
@@ -586,16 +582,16 @@
         _new_thread(_run_one_sort, arrays[i], bar, finished)
     finished.wait()
 
-    print 'all threads done, and checking results ...'
+    print('all threads done, and checking results ...')
     if alive:
-        raise ValueError, ('threads still alive at end', alive)
+        raise ValueError('threads still alive at end', alive)
     for i in range(NSORTS):
         a = arrays[i]
         if len(a) != (i+1)*10:
-            raise ValueError, ('length of array', i, 'screwed up')
+            raise ValueError('length of array', i, 'screwed up')
         _check_sort(a)
 
-    print 'test passed!', TID, 'threads created in all'
+    print('test passed!', TID, 'threads created in all')
 
 if __name__ == '__main__':
     test()
diff --git a/Demo/threads/telnet.py b/Demo/threads/telnet.py
index 09f3bd9..7366341 100644
--- a/Demo/threads/telnet.py
+++ b/Demo/threads/telnet.py
@@ -76,7 +76,7 @@
         cleandata = ''
         for c in data:
             if opt:
-                print ord(c)
+                print(ord(c))
 ##                              print '(replying: %r)' % (opt+c,)
                 s.send(opt + c)
                 opt = ''
@@ -85,18 +85,18 @@
                 if c == IAC:
                     cleandata = cleandata + c
                 elif c in (DO, DONT):
-                    if c == DO: print '(DO)',
-                    else: print '(DONT)',
+                    if c == DO: print('(DO)', end=' ')
+                    else: print('(DONT)', end=' ')
                     opt = IAC + WONT
                 elif c in (WILL, WONT):
-                    if c == WILL: print '(WILL)',
-                    else: print '(WONT)',
+                    if c == WILL: print('(WILL)', end=' ')
+                    else: print('(WONT)', end=' ')
                     opt = IAC + DONT
                 else:
-                    print '(command)', ord(c)
+                    print('(command)', ord(c))
             elif c == IAC:
                 iac = 1
-                print '(IAC)',
+                print('(IAC)', end=' ')
             else:
                 cleandata = cleandata + c
         sys.stdout.write(cleandata)
diff --git a/Demo/tix/samples/OptMenu.py b/Demo/tix/samples/OptMenu.py
index 1d39420..2cf625a 100755
--- a/Demo/tix/samples/OptMenu.py
+++ b/Demo/tix/samples/OptMenu.py
@@ -40,7 +40,7 @@
     #        global variables "demo_opt_from" and "demo_opt_to". Otherwise
     #        the OptionMenu widget will complain about "unknown options"!
     #
-    for opt in options.keys():
+    for opt in list(options.keys()):
         from_file.add_command(opt, label=options[opt])
         to_file.add_command(opt, label=options[opt])
 
diff --git a/Demo/tix/tixwidgets.py b/Demo/tix/tixwidgets.py
index bf7102a..49d1e7f 100644
--- a/Demo/tix/tixwidgets.py
+++ b/Demo/tix/tixwidgets.py
@@ -166,7 +166,7 @@
                 try: tkMessageBox.showerror ('Error', text)
                 except: pass
                 self.exit = 1
-                raise SystemExit, 1
+                raise SystemExit(1)
 
     def destroy (self):
         self.root.destroy()
diff --git a/Demo/tkinter/guido/AttrDialog.py b/Demo/tkinter/guido/AttrDialog.py
index d8b2571..98bdd14 100755
--- a/Demo/tkinter/guido/AttrDialog.py
+++ b/Demo/tkinter/guido/AttrDialog.py
@@ -112,7 +112,7 @@
     def addchoices(self):
         self.choices = {}
         list = []
-        for k, dc in self.options.items():
+        for k, dc in list(self.options.items()):
             list.append((k, dc))
         list.sort()
         for k, (d, c) in list:
@@ -157,7 +157,7 @@
             try:
                 self.dialog.widget.pack(**{self.option: self.current})
             except TclError as msg:
-                print msg
+                print(msg)
                 self.refresh()
 
     class booleanoption(packoption, BooleanOption): pass
@@ -213,7 +213,7 @@
                                      'info',
                                      self.widget))
         except TclError as msg:
-            print msg
+            print(msg)
             return
         dict = {}
         for i in range(0, len(words), 2):
@@ -240,7 +240,7 @@
                         self.dialog.master.tk.merge(
                                 self.current))
             except TclError as msg:
-                print msg
+                print(msg)
                 self.refresh()
 
     class booleanoption(remotepackoption, BooleanOption): pass
@@ -256,11 +256,11 @@
         Dialog.__init__(self, widget)
 
     def fixclasses(self):
-        if self.addclasses.has_key(self.klass):
+        if self.klass in self.addclasses:
             classes = {}
             for c in (self.classes,
                       self.addclasses[self.klass]):
-                for k in c.keys():
+                for k in list(c.keys()):
                     classes[k] = c[k]
             self.classes = classes
 
@@ -273,7 +273,7 @@
     def update(self):
         self.current = {}
         self.options = {}
-        for k, v in self.configuration.items():
+        for k, v in list(self.configuration.items()):
             if len(v) > 4:
                 self.current[k] = v[4]
                 self.options[k] = v[3], v[2] # default, klass
@@ -286,7 +286,7 @@
             try:
                 self.dialog.widget[self.option] = self.current
             except TclError as msg:
-                print msg
+                print(msg)
                 self.refresh()
 
     class booleanoption(widgetoption, BooleanOption): pass
@@ -375,7 +375,7 @@
                                      self.widget,
                                      'config'))
         except TclError as msg:
-            print msg
+            print(msg)
             return
         dict = {}
         for item in items:
@@ -399,7 +399,7 @@
                         '-'+self.option,
                         self.current)
             except TclError as msg:
-                print msg
+                print(msg)
                 self.refresh()
 
     class booleanoption(remotewidgetoption, BooleanOption): pass
@@ -446,6 +446,6 @@
         try:
             RemotePackDialog(list, list.app, widget)
         except TclError as msg:
-            print msg
+            print(msg)
 
 test()
diff --git a/Demo/tkinter/guido/ManPage.py b/Demo/tkinter/guido/ManPage.py
index b189b64..1266f1c 100755
--- a/Demo/tkinter/guido/ManPage.py
+++ b/Demo/tkinter/guido/ManPage.py
@@ -75,7 +75,7 @@
     # Initialize parsing from a particular file -- must not be busy
     def _startparser(self, fp):
         if self.busy():
-            raise RuntimeError, 'startparser: still busy'
+            raise RuntimeError('startparser: still busy')
         fp.fileno()             # Test for file-ness
         self.fp = fp
         self.lineno = 0
@@ -90,7 +90,7 @@
     # End parsing -- must be busy, need not be at EOF
     def _endparser(self):
         if not self.busy():
-            raise RuntimeError, 'endparser: not busy'
+            raise RuntimeError('endparser: not busy')
         if self.buffer:
             self._parseline('')
         try:
diff --git a/Demo/tkinter/guido/ShellWindow.py b/Demo/tkinter/guido/ShellWindow.py
index 104e06d..d7e0a0e 100755
--- a/Demo/tkinter/guido/ShellWindow.py
+++ b/Demo/tkinter/guido/ShellWindow.py
@@ -37,7 +37,7 @@
         if not data:
             self.tk.deletefilehandler(file)
             pid, sts = os.waitpid(self.pid, 0)
-            print 'pid', pid, 'status', sts
+            print('pid', pid, 'status', sts)
             self.pid = None
             detail = sts>>8
             cause = sts & 0xff
diff --git a/Demo/tkinter/guido/dialog.py b/Demo/tkinter/guido/dialog.py
index 50d84b9..426eca4 100755
--- a/Demo/tkinter/guido/dialog.py
+++ b/Demo/tkinter/guido/dialog.py
@@ -81,7 +81,7 @@
                '',
                -1,
                'OK')
-    print 'pressed button', i
+    print('pressed button', i)
     i = dialog(mainWidget,
                'File Modified',
                'File "tcl.h" has been modified since '
@@ -92,7 +92,7 @@
                'Save File',
                'Discard Changes',
                'Return To Editor')
-    print 'pressed button', i
+    print('pressed button', i)
 
 def test():
     import sys
diff --git a/Demo/tkinter/guido/mbox.py b/Demo/tkinter/guido/mbox.py
index 47c38b9..88b0b89 100755
--- a/Demo/tkinter/guido/mbox.py
+++ b/Demo/tkinter/guido/mbox.py
@@ -28,7 +28,7 @@
     try:
         opts, args = getopt.getopt(sys.argv[1:], '')
     except getopt.error as msg:
-        print msg
+        print(msg)
         sys.exit(2)
     for arg in args:
         if arg[:1] == '+':
@@ -278,8 +278,6 @@
         scanbox.insert('end', line)
 
 def scanfolder(folder = 'inbox', sequence = 'all'):
-    return map(
-            lambda line: line[:-1],
-            os.popen('scan +%s %s' % (folder, sequence), 'r').readlines())
+    return [line[:-1] for line in os.popen('scan +%s %s' % (folder, sequence), 'r').readlines()]
 
 main()
diff --git a/Demo/tkinter/guido/rmt.py b/Demo/tkinter/guido/rmt.py
index 440650c..c177c72 100755
--- a/Demo/tkinter/guido/rmt.py
+++ b/Demo/tkinter/guido/rmt.py
@@ -134,7 +134,7 @@
     file_m_apps.add('command')
     file_m_apps.delete(0, 'last')
     names = root.winfo_interps()
-    names = map(None, names) # convert tuple to list
+    names = list(names) # convert tuple to list
     names.sort()
     for name in names:
         try:
diff --git a/Demo/tkinter/guido/solitaire.py b/Demo/tkinter/guido/solitaire.py
index 50a8b26..68dc284 100755
--- a/Demo/tkinter/guido/solitaire.py
+++ b/Demo/tkinter/guido/solitaire.py
@@ -80,7 +80,7 @@
 for s in (CLUBS, SPADES):
     COLOR[s] = BLACK
 
-ALLSUITS = COLOR.keys()
+ALLSUITS = list(COLOR.keys())
 NSUITS = len(ALLSUITS)
 
 
@@ -99,7 +99,7 @@
 # dummy element at index 0 so it can be indexed directly with the card
 # value.
 
-VALNAMES = ["", "A"] + map(str, range(2, 11)) + ["J", "Q", "K"]
+VALNAMES = ["", "A"] + list(map(str, range(2, 11))) + ["J", "Q", "K"]
 
 
 # Solitaire constants.  The only one I can think of is the number of
diff --git a/Demo/tkinter/guido/sortvisu.py b/Demo/tkinter/guido/sortvisu.py
index 3e4454f..c538a2c 100644
--- a/Demo/tkinter/guido/sortvisu.py
+++ b/Demo/tkinter/guido/sortvisu.py
@@ -344,7 +344,7 @@
 
 def interpolate(oldpts, newpts, n):
     if len(oldpts) != len(newpts):
-        raise ValueError, "can't interpolate arrays of different length"
+        raise ValueError("can't interpolate arrays of different length")
     pts = [0]*len(oldpts)
     res = [tuple(oldpts)]
     for i in range(1, n):
diff --git a/Demo/tkinter/guido/ss1.py b/Demo/tkinter/guido/ss1.py
index 8935475..d957907 100644
--- a/Demo/tkinter/guido/ss1.py
+++ b/Demo/tkinter/guido/ss1.py
@@ -136,13 +136,13 @@
         return maxx, maxy
 
     def reset(self):
-        for cell in self.cells.itervalues():
+        for cell in self.cells.values():
             if hasattr(cell, 'reset'):
                 cell.reset()
 
     def recalc(self):
         self.reset()
-        for cell in self.cells.itervalues():
+        for cell in self.cells.values():
             if hasattr(cell, 'recalc'):
                 cell.recalc(self.rexec)
 
@@ -160,7 +160,7 @@
             full[0, y] = text, alignment = str(y), RIGHT
             colwidth[0] = max(colwidth[0], len(text))
         # Add sheet cells in columns with x>0 and y>0
-        for (x, y), cell in self.cells.iteritems():
+        for (x, y), cell in self.cells.items():
             if x <= 0 or y <= 0:
                 continue
             if hasattr(cell, 'recalc'):
@@ -192,13 +192,13 @@
                 if line:
                     line += '|'
                 line += text
-            print line
+            print(line)
             if y == 0:
-                print sep
+                print(sep)
 
     def xml(self):
         out = ['<spreadsheet>']
-        for (x, y), cell in self.cells.iteritems():
+        for (x, y), cell in self.cells.items():
             if hasattr(cell, 'xml'):
                 cellxml = cell.xml()
             else:
@@ -236,7 +236,7 @@
     def startelement(self, tag, attrs):
         method = getattr(self, 'start_'+tag, None)
         if method:
-            for key, value in attrs.iteritems():
+            for key, value in attrs.items():
                 attrs[key] = str(value) # XXX Convert Unicode to 8-bit
             method(attrs)
         self.texts = []
@@ -268,7 +268,7 @@
 
     def end_long(self, text):
         try:
-            self.value = long(text)
+            self.value = int(text)
         except:
             self.value = None
 
@@ -325,7 +325,7 @@
 class NumericCell(BaseCell):
 
     def __init__(self, value, fmt="%s", alignment=RIGHT):
-        assert isinstance(value, (int, long, float, complex))
+        assert isinstance(value, (int, int, float, complex))
         assert alignment in (LEFT, CENTER, RIGHT)
         self.value = value
         self.fmt = fmt
@@ -366,7 +366,7 @@
 class StringCell(BaseCell):
 
     def __init__(self, text, fmt="%s", alignment=LEFT):
-        assert isinstance(text, (str, unicode))
+        assert isinstance(text, (str, str))
         assert alignment in (LEFT, CENTER, RIGHT)
         self.text = text
         self.fmt = fmt
@@ -699,7 +699,7 @@
             x1, x2 = x2, x1
         if y1 > y2:
             y1, y2 = y2, y1
-        for (x, y), cell in self.gridcells.iteritems():
+        for (x, y), cell in self.gridcells.items():
             if x1 <= x <= x2 and y1 <= y <= y2:
                 cell['bg'] = 'lightBlue'
         gridcell = self.gridcells.get(self.currentxy)
@@ -735,7 +735,7 @@
                 x1, x2 = x2, x1
             if y1 > y2:
                 y1, y2 = y2, y1
-            for (x, y), cell in self.gridcells.iteritems():
+            for (x, y), cell in self.gridcells.items():
                 if x1 <= x <= x2 and y1 <= y <= y2:
                     cell['bg'] = 'white'
 
@@ -775,7 +775,7 @@
         if text.startswith('='):
             cell = FormulaCell(text[1:])
         else:
-            for cls in int, long, float, complex:
+            for cls in int, int, float, complex:
                 try:
                     value = cls(text)
                 except:
@@ -794,7 +794,7 @@
     def sync(self):
         "Fill the GUI cells from the sheet cells."
         self.sheet.recalc()
-        for (x, y), gridcell in self.gridcells.iteritems():
+        for (x, y), gridcell in self.gridcells.items():
             if x == 0 or y == 0:
                 continue
             cell = self.sheet.getcell(x, y)
diff --git a/Demo/tkinter/guido/svkill.py b/Demo/tkinter/guido/svkill.py
index 95f61b8..378d58f 100755
--- a/Demo/tkinter/guido/svkill.py
+++ b/Demo/tkinter/guido/svkill.py
@@ -5,7 +5,7 @@
 from Tkinter import *
 
 if TkVersion < 4.0:
-    raise ImportError, "This version of svkill requires Tk 4.0 or later"
+    raise ImportError("This version of svkill requires Tk 4.0 or later")
 
 from string import splitfields
 from string import split
diff --git a/Demo/tkinter/guido/tkman.py b/Demo/tkinter/guido/tkman.py
index 810bdf8..c84d889 100755
--- a/Demo/tkinter/guido/tkman.py
+++ b/Demo/tkinter/guido/tkman.py
@@ -172,8 +172,8 @@
 
     def updatelist(self):
         key = self.entry.get()
-        ok = filter(lambda name, key=key, n=len(key): name[:n]==key,
-                 self.choices)
+        ok = list(filter(lambda name, key=key, n=len(key): name[:n]==key,
+                 self.choices))
         if not ok:
             self.frame.bell()
         self.listbox.delete(0, AtEnd())
@@ -205,7 +205,7 @@
     def search_string(self, search):
         if not search:
             self.frame.bell()
-            print 'Empty search string'
+            print('Empty search string')
             return
         if not self.casevar.get():
             map = re.IGNORECASE
@@ -218,7 +218,7 @@
                 prog = re.compile(search)
         except re.error as msg:
             self.frame.bell()
-            print 'Regex error:', msg
+            print('Regex error:', msg)
             return
         here = self.text.index(AtInsert())
         lineno = string.atoi(here[:string.find(here, '.')])
diff --git a/Demo/tkinter/guido/wish.py b/Demo/tkinter/guido/wish.py
index 2367e25..bebab1e 100755
--- a/Demo/tkinter/guido/wish.py
+++ b/Demo/tkinter/guido/wish.py
@@ -24,7 +24,7 @@
         try:
             result = tk.call('eval', cmd)
         except _tkinter.TclError as msg:
-            print 'TclError:', msg
+            print('TclError:', msg)
         else:
-            if result: print result
+            if result: print(result)
         cmd = ''
diff --git a/Demo/tkinter/matt/00-HELLO-WORLD.py b/Demo/tkinter/matt/00-HELLO-WORLD.py
index 1c3151b..20a2050 100644
--- a/Demo/tkinter/matt/00-HELLO-WORLD.py
+++ b/Demo/tkinter/matt/00-HELLO-WORLD.py
@@ -5,7 +5,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
         self.QUIT = Button(self, text='QUIT', foreground='red',
diff --git a/Demo/tkinter/matt/animation-simple.py b/Demo/tkinter/matt/animation-simple.py
index b52e1dc..071bde7 100644
--- a/Demo/tkinter/matt/animation-simple.py
+++ b/Demo/tkinter/matt/animation-simple.py
@@ -4,7 +4,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
         self.QUIT = Button(self, text='QUIT', foreground='red',
diff --git a/Demo/tkinter/matt/animation-w-velocity-ctrl.py b/Demo/tkinter/matt/animation-w-velocity-ctrl.py
index e676338..68eb1d0 100644
--- a/Demo/tkinter/matt/animation-w-velocity-ctrl.py
+++ b/Demo/tkinter/matt/animation-w-velocity-ctrl.py
@@ -8,7 +8,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
         self.QUIT = Button(self, text='QUIT', foreground='red',
diff --git a/Demo/tkinter/matt/bind-w-mult-calls-p-type.py b/Demo/tkinter/matt/bind-w-mult-calls-p-type.py
index f3220da..f744d26 100644
--- a/Demo/tkinter/matt/bind-w-mult-calls-p-type.py
+++ b/Demo/tkinter/matt/bind-w-mult-calls-p-type.py
@@ -24,11 +24,11 @@
         self.entrythingy.bind('<Key-Return>', self.print_something_else, "+")
 
     def print_contents(self, event):
-        print "hi. contents of entry is now ---->", self.entrythingy.get()
+        print("hi. contents of entry is now ---->", self.entrythingy.get())
 
 
     def print_something_else(self, event):
-        print "hi. Now doing something completely different"
+        print("hi. Now doing something completely different")
 
 
 root = App()
diff --git a/Demo/tkinter/matt/canvas-demo-simple.py b/Demo/tkinter/matt/canvas-demo-simple.py
index a01679a..b677ccd 100644
--- a/Demo/tkinter/matt/canvas-demo-simple.py
+++ b/Demo/tkinter/matt/canvas-demo-simple.py
@@ -4,7 +4,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
         self.QUIT = Button(self, text='QUIT', foreground='red',
diff --git a/Demo/tkinter/matt/canvas-gridding.py b/Demo/tkinter/matt/canvas-gridding.py
index 3c52b91..84f4ea0 100644
--- a/Demo/tkinter/matt/canvas-gridding.py
+++ b/Demo/tkinter/matt/canvas-gridding.py
@@ -7,7 +7,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
         self.QUIT = Button(self, text='QUIT',
diff --git a/Demo/tkinter/matt/canvas-reading-tag-info.py b/Demo/tkinter/matt/canvas-reading-tag-info.py
index f57ea18..75990c9 100644
--- a/Demo/tkinter/matt/canvas-reading-tag-info.py
+++ b/Demo/tkinter/matt/canvas-reading-tag-info.py
@@ -3,7 +3,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
         self.QUIT = Button(self, text='QUIT', foreground='red',
@@ -28,14 +28,14 @@
         # is used for widgets. (remember, this is for ITEMS drawn
         # on a canvas widget, not widgets)
         option_value = self.drawing.itemconfig(pgon, "stipple")
-        print "pgon's current stipple value is -->", option_value[4], "<--"
+        print("pgon's current stipple value is -->", option_value[4], "<--")
         option_value = self.drawing.itemconfig(pgon,  "fill")
-        print "pgon's current fill value is -->", option_value[4], "<--"
-        print "  when he is usually colored -->", option_value[3], "<--"
+        print("pgon's current fill value is -->", option_value[4], "<--")
+        print("  when he is usually colored -->", option_value[3], "<--")
 
         ## here we print out all the tags associated with this object
         option_value = self.drawing.itemconfig(pgon,  "tags")
-        print "pgon's tags are", option_value[4]
+        print("pgon's tags are", option_value[4])
 
         self.drawing.pack(side=LEFT)
 
diff --git a/Demo/tkinter/matt/canvas-w-widget-draw-el.py b/Demo/tkinter/matt/canvas-w-widget-draw-el.py
index 5b26210..3cbf937 100644
--- a/Demo/tkinter/matt/canvas-w-widget-draw-el.py
+++ b/Demo/tkinter/matt/canvas-w-widget-draw-el.py
@@ -4,7 +4,7 @@
 
 class Test(Frame):
     def printhi(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
         self.QUIT = Button(self, text='QUIT', foreground='red',
diff --git a/Demo/tkinter/matt/canvas-with-scrollbars.py b/Demo/tkinter/matt/canvas-with-scrollbars.py
index 81ef25a..b55215d 100644
--- a/Demo/tkinter/matt/canvas-with-scrollbars.py
+++ b/Demo/tkinter/matt/canvas-with-scrollbars.py
@@ -7,7 +7,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
         self.question = Label(self, text="Can Find The BLUE Square??????")
@@ -46,8 +46,8 @@
 
 
     def scrollCanvasX(self, *args):
-        print "scrolling", args
-        print self.draw.scrollX.get()
+        print("scrolling", args)
+        print(self.draw.scrollX.get())
 
 
     def __init__(self, master=None):
diff --git a/Demo/tkinter/matt/dialog-box.py b/Demo/tkinter/matt/dialog-box.py
index dea8f39..0c71c3a 100644
--- a/Demo/tkinter/matt/dialog-box.py
+++ b/Demo/tkinter/matt/dialog-box.py
@@ -6,7 +6,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def makeWindow(self):
         """Create a top-level dialog with some buttons.
diff --git a/Demo/tkinter/matt/entry-simple.py b/Demo/tkinter/matt/entry-simple.py
index 5146e6f..0bf4cab 100644
--- a/Demo/tkinter/matt/entry-simple.py
+++ b/Demo/tkinter/matt/entry-simple.py
@@ -17,7 +17,7 @@
         self.entrythingy.bind('<Key-Return>', self.print_contents)
 
     def print_contents(self, event):
-        print "hi. contents of entry is now ---->", self.entrythingy.get()
+        print("hi. contents of entry is now ---->", self.entrythingy.get())
 
 root = App()
 root.master.title("Foo")
diff --git a/Demo/tkinter/matt/entry-with-shared-variable.py b/Demo/tkinter/matt/entry-with-shared-variable.py
index 2b76162..c7cd259 100644
--- a/Demo/tkinter/matt/entry-with-shared-variable.py
+++ b/Demo/tkinter/matt/entry-with-shared-variable.py
@@ -39,7 +39,7 @@
         self.contents.set(str)
 
     def print_contents(self, event):
-        print "hi. contents of entry is now ---->", self.contents.get()
+        print("hi. contents of entry is now ---->", self.contents.get())
 
 root = App()
 root.master.title("Foo")
diff --git a/Demo/tkinter/matt/killing-window-w-wm.py b/Demo/tkinter/matt/killing-window-w-wm.py
index 6a0e2fe..23ac103 100644
--- a/Demo/tkinter/matt/killing-window-w-wm.py
+++ b/Demo/tkinter/matt/killing-window-w-wm.py
@@ -7,11 +7,11 @@
 
 ### ******* this isn't really called -- read the comments
 def my_delete_callback():
-    print "whoops -- tried to delete me!"
+    print("whoops -- tried to delete me!")
 
 class Test(Frame):
     def deathHandler(self, event):
-        print self, "is now getting nuked. performing some save here...."
+        print(self, "is now getting nuked. performing some save here....")
 
     def createWidgets(self):
         # a hello button
diff --git a/Demo/tkinter/matt/menu-all-types-of-entries.py b/Demo/tkinter/matt/menu-all-types-of-entries.py
index f4afe4a..e4e4bfd 100644
--- a/Demo/tkinter/matt/menu-all-types-of-entries.py
+++ b/Demo/tkinter/matt/menu-all-types-of-entries.py
@@ -35,13 +35,13 @@
 
 # some miscellaneous callbacks
 def new_file():
-    print "opening new file"
+    print("opening new file")
 
 def open_file():
-    print "opening OLD file"
+    print("opening OLD file")
 
 def print_something():
-    print "picked a menu item"
+    print("picked a menu item")
 
 
 
@@ -50,7 +50,7 @@
 def print_anchovies():
     global anchovies
     anchovies = not anchovies
-    print "anchovies?", anchovies
+    print("anchovies?", anchovies)
 
 def makeCommandMenu():
     # make menu button
diff --git a/Demo/tkinter/matt/menu-simple.py b/Demo/tkinter/matt/menu-simple.py
index 46b5364..2487561 100644
--- a/Demo/tkinter/matt/menu-simple.py
+++ b/Demo/tkinter/matt/menu-simple.py
@@ -34,11 +34,11 @@
 
 
 def new_file():
-    print "opening new file"
+    print("opening new file")
 
 
 def open_file():
-    print "opening OLD file"
+    print("opening OLD file")
 
 
 def makeFileMenu():
diff --git a/Demo/tkinter/matt/packer-and-placer-together.py b/Demo/tkinter/matt/packer-and-placer-together.py
index 184d56b..84d3ee0 100644
--- a/Demo/tkinter/matt/packer-and-placer-together.py
+++ b/Demo/tkinter/matt/packer-and-placer-together.py
@@ -8,7 +8,7 @@
     app.button.place(x=event.x, y=event.y)
 
 def dothis():
-    print 'calling me!'
+    print('calling me!')
 
 def createWidgets(top):
     # make a frame. Note that the widget is 200 x 200
diff --git a/Demo/tkinter/matt/packer-simple.py b/Demo/tkinter/matt/packer-simple.py
index f55f1be..1a505dd 100644
--- a/Demo/tkinter/matt/packer-simple.py
+++ b/Demo/tkinter/matt/packer-simple.py
@@ -3,7 +3,7 @@
 
 class Test(Frame):
     def printit(self):
-        print self.hi_there["command"]
+        print(self.hi_there["command"])
 
     def createWidgets(self):
         # a hello button
diff --git a/Demo/tkinter/matt/placer-simple.py b/Demo/tkinter/matt/placer-simple.py
index 30d9e9e..992a8fc 100644
--- a/Demo/tkinter/matt/placer-simple.py
+++ b/Demo/tkinter/matt/placer-simple.py
@@ -6,7 +6,7 @@
     app.button.place(x=event.x, y=event.y)
 
 def dothis():
-    print 'calling me!'
+    print('calling me!')
 
 def createWidgets(top):
     # make a frame. Note that the widget is 200 x 200
diff --git a/Demo/tkinter/matt/printing-coords-of-items.py b/Demo/tkinter/matt/printing-coords-of-items.py
index a37733d..c74c1c3 100644
--- a/Demo/tkinter/matt/printing-coords-of-items.py
+++ b/Demo/tkinter/matt/printing-coords-of-items.py
@@ -35,7 +35,7 @@
         # the "current" tag is applied to the object the cursor is over.
         # this happens automatically.
         self.draw.itemconfig(CURRENT, fill="red")
-        print self.draw.coords(CURRENT)
+        print(self.draw.coords(CURRENT))
 
     def mouseLeave(self, event):
         # the "current" tag is applied to the object the cursor is over.
diff --git a/Demo/tkinter/matt/radiobutton-simple.py b/Demo/tkinter/matt/radiobutton-simple.py
index e9d6afe..eeddb23 100644
--- a/Demo/tkinter/matt/radiobutton-simple.py
+++ b/Demo/tkinter/matt/radiobutton-simple.py
@@ -12,7 +12,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
 
diff --git a/Demo/tkinter/matt/rubber-band-box-demo-1.py b/Demo/tkinter/matt/rubber-band-box-demo-1.py
index b00518e..66b8f8b 100644
--- a/Demo/tkinter/matt/rubber-band-box-demo-1.py
+++ b/Demo/tkinter/matt/rubber-band-box-demo-1.py
@@ -2,7 +2,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
         self.QUIT = Button(self, text='QUIT',
diff --git a/Demo/tkinter/matt/rubber-line-demo-1.py b/Demo/tkinter/matt/rubber-line-demo-1.py
index 59b8bd9..b1c8e78 100644
--- a/Demo/tkinter/matt/rubber-line-demo-1.py
+++ b/Demo/tkinter/matt/rubber-line-demo-1.py
@@ -2,7 +2,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
         self.QUIT = Button(self, text='QUIT',
diff --git a/Demo/tkinter/matt/slider-demo-1.py b/Demo/tkinter/matt/slider-demo-1.py
index db6114b..5662db9 100644
--- a/Demo/tkinter/matt/slider-demo-1.py
+++ b/Demo/tkinter/matt/slider-demo-1.py
@@ -5,7 +5,7 @@
 
 class Test(Frame):
     def print_value(self, val):
-        print "slider now at", val
+        print("slider now at", val)
 
     def reset(self):
         self.slider.set(0)
diff --git a/Demo/tkinter/matt/subclass-existing-widgets.py b/Demo/tkinter/matt/subclass-existing-widgets.py
index 0e08f92..fc04859 100644
--- a/Demo/tkinter/matt/subclass-existing-widgets.py
+++ b/Demo/tkinter/matt/subclass-existing-widgets.py
@@ -5,7 +5,7 @@
 
 class New_Button(Button):
     def callback(self):
-        print self.counter
+        print(self.counter)
         self.counter = self.counter + 1
 
 def createWidgets(top):
diff --git a/Demo/tkinter/matt/two-radio-groups.py b/Demo/tkinter/matt/two-radio-groups.py
index 9fd8f4f..52513ba 100644
--- a/Demo/tkinter/matt/two-radio-groups.py
+++ b/Demo/tkinter/matt/two-radio-groups.py
@@ -75,9 +75,9 @@
 
 
 def printStuff():
-    print "party is", party.get()
-    print "flavor is", flavor.get()
-    print
+    print("party is", party.get())
+    print("flavor is", flavor.get())
+    print()
 
 #################################################
 #### Main starts here ...
diff --git a/Demo/tkinter/matt/window-creation-more.py b/Demo/tkinter/matt/window-creation-more.py
index eb0eb6f..3a4ce19 100644
--- a/Demo/tkinter/matt/window-creation-more.py
+++ b/Demo/tkinter/matt/window-creation-more.py
@@ -5,7 +5,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def makeWindow(self):
         fred = Toplevel()
diff --git a/Demo/tkinter/matt/window-creation-simple.py b/Demo/tkinter/matt/window-creation-simple.py
index c990ed9..fdf1dcc 100644
--- a/Demo/tkinter/matt/window-creation-simple.py
+++ b/Demo/tkinter/matt/window-creation-simple.py
@@ -4,7 +4,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def makeWindow(self):
         fred = Toplevel()
diff --git a/Demo/tkinter/matt/window-creation-w-location.py b/Demo/tkinter/matt/window-creation-w-location.py
index 9f23bac..af6f876 100644
--- a/Demo/tkinter/matt/window-creation-w-location.py
+++ b/Demo/tkinter/matt/window-creation-w-location.py
@@ -9,9 +9,9 @@
 
 class QuitButton(Button):
     def __init__(self, master, *args, **kwargs):
-        if not kwargs.has_key("text"):
+        if "text" not in kwargs:
             kwargs["text"] = "QUIT"
-        if not kwargs.has_key("command"):
+        if "command" not in kwargs:
             kwargs["command"] = master.quit
         Button.__init__(self, master, *args, **kwargs)
 
diff --git a/Demo/xml/elem_count.py b/Demo/xml/elem_count.py
index 7b53189..a2b4647 100644
--- a/Demo/xml/elem_count.py
+++ b/Demo/xml/elem_count.py
@@ -15,20 +15,20 @@
         self._attrs = self._attrs + len(attrs)
         self._elem_types[name] = self._elem_types.get(name, 0) + 1
 
-        for name in attrs.keys():
+        for name in list(attrs.keys()):
             self._attr_types[name] = self._attr_types.get(name, 0) + 1
 
     def endDocument(self):
-        print "There were", self._elems, "elements."
-        print "There were", self._attrs, "attributes."
+        print("There were", self._elems, "elements.")
+        print("There were", self._attrs, "attributes.")
 
-        print "---ELEMENT TYPES"
-        for pair in  self._elem_types.items():
-            print "%20s %d" % pair
+        print("---ELEMENT TYPES")
+        for pair in  list(self._elem_types.items()):
+            print("%20s %d" % pair)
 
-        print "---ATTRIBUTE TYPES"
-        for pair in  self._attr_types.items():
-            print "%20s %d" % pair
+        print("---ATTRIBUTE TYPES")
+        for pair in  list(self._attr_types.items()):
+            print("%20s %d" % pair)
 
 
 parser = make_parser()
diff --git a/Demo/xml/roundtrip.py b/Demo/xml/roundtrip.py
index 8d7d437..b0e131e 100644
--- a/Demo/xml/roundtrip.py
+++ b/Demo/xml/roundtrip.py
@@ -22,7 +22,7 @@
 
     def startElement(self, name, attrs):
         self._out.write('<' + name)
-        for (name, value) in attrs.items():
+        for (name, value) in list(attrs.items()):
             self._out.write(' %s="%s"' % (name, saxutils.escape(value)))
         self._out.write('>')
 
diff --git a/Demo/zlib/minigzip.py b/Demo/zlib/minigzip.py
index 87fed4a..28d8b26 100755
--- a/Demo/zlib/minigzip.py
+++ b/Demo/zlib/minigzip.py
@@ -49,10 +49,10 @@
 def decompress (input, output):
     magic = input.read(2)
     if magic != '\037\213':
-        print 'Not a gzipped file'
+        print('Not a gzipped file')
         sys.exit(0)
     if ord(input.read(1)) != 8:
-        print 'Unknown compression method'
+        print('Unknown compression method')
         sys.exit(0)
     flag = ord(input.read(1))
     input.read(4+1+1)                   # Discard modification time,
@@ -100,14 +100,14 @@
     crc32 = read32(input)
     isize = read32(input)
     if crc32 != crcval:
-        print 'CRC check failed.'
+        print('CRC check failed.')
     if isize != length:
-        print 'Incorrect length of data produced'
+        print('Incorrect length of data produced')
 
 def main():
     if len(sys.argv)!=2:
-        print 'Usage: minigzip.py <filename>'
-        print '  The file will be compressed or decompressed.'
+        print('Usage: minigzip.py <filename>')
+        print('  The file will be compressed or decompressed.')
         sys.exit(0)
 
     filename = sys.argv[1]
diff --git a/Demo/zlib/zlibdemo.py b/Demo/zlib/zlibdemo.py
index b449c19..53463dd 100755
--- a/Demo/zlib/zlibdemo.py
+++ b/Demo/zlib/zlibdemo.py
@@ -11,7 +11,7 @@
         filename = sys.argv[1]
     else:
         filename = sys.argv[0]
-    print 'Reading', filename
+    print('Reading', filename)
 
     f = open(filename, 'rb')           # Get the data to compress
     s = f.read()
@@ -21,9 +21,9 @@
     comptext = zlib.compress(s, 1)
     decomp = zlib.decompress(comptext)
 
-    print '1-step compression: (level 1)'
-    print '    Original:', len(s), 'Compressed:', len(comptext),
-    print 'Uncompressed:', len(decomp)
+    print('1-step compression: (level 1)')
+    print('    Original:', len(s), 'Compressed:', len(comptext), end=' ')
+    print('Uncompressed:', len(decomp))
 
     # Now, let's compress the string in stages; set chunk to work in smaller steps
 
@@ -40,9 +40,9 @@
         decomp = decomp + decompressor.decompress(comptext[i:i+chunk])
     decomp=decomp+decompressor.flush()
 
-    print 'Progressive compression (level 9):'
-    print '    Original:', len(s), 'Compressed:', len(comptext),
-    print 'Uncompressed:', len(decomp)
+    print('Progressive compression (level 9):')
+    print('    Original:', len(s), 'Compressed:', len(comptext), end=' ')
+    print('Uncompressed:', len(decomp))
 
 if __name__ == '__main__':
     main()