diff --git a/Demo/scripts/lpwatch.py b/Demo/scripts/lpwatch.py
index 262e562..90b3ecf 100755
--- a/Demo/scripts/lpwatch.py
+++ b/Demo/scripts/lpwatch.py
@@ -3,10 +3,9 @@
 # Watch line printer queue(s).
 # Intended for BSD 4.3 lpq.
 
-import posix
+import os
 import sys
 import time
-import string
 
 DEF_PRINTER = 'psc'
 DEF_DELAY = 10
@@ -14,94 +13,87 @@
 def main():
     delay = DEF_DELAY # XXX Use getopt() later
     try:
-        thisuser = posix.environ['LOGNAME']
+        thisuser = os.environ['LOGNAME']
     except:
-        thisuser = posix.environ['USER']
+        thisuser = os.environ['USER']
     printers = sys.argv[1:]
     if printers:
         # Strip '-P' from printer names just in case
         # the user specified it...
-        for i in range(len(printers)):
-            if printers[i][:2] == '-P':
-                printers[i] = printers[i][2:]
+        for i, name in enumerate(printers):
+            if name[:2] == '-P':
+                printers[i] = name[2:]
     else:
-        if 'PRINTER' in posix.environ:
-            printers = [posix.environ['PRINTER']]
+        if 'PRINTER' in os.environ:
+            printers = [os.environ['PRINTER']]
         else:
             printers = [DEF_PRINTER]
-    #
-    clearhome = posix.popen('clear', 'r').read()
-    #
-    while 1:
+
+    clearhome = os.popen('clear', 'r').read()
+
+    while True:
         text = clearhome
         for name in printers:
-            text = text + makestatus(name, thisuser) + '\n'
+            text += makestatus(name, thisuser) + '\n'
         print(text)
         time.sleep(delay)
 
 def makestatus(name, thisuser):
-    pipe = posix.popen('lpq -P' + name + ' 2>&1', 'r')
+    pipe = os.popen('lpq -P' + name + ' 2>&1', 'r')
     lines = []
     users = {}
     aheadbytes = 0
     aheadjobs = 0
-    userseen = 0
+    userseen = False
     totalbytes = 0
     totaljobs = 0
-    while 1:
-        line = pipe.readline()
-        if not line: break
-        fields = string.split(line)
+    for line in pipe:
+        fields = line.split()
         n = len(fields)
         if len(fields) >= 6 and fields[n-1] == 'bytes':
-            rank = fields[0]
-            user = fields[1]
-            job = fields[2]
+            rank, user, job = fields[0:3]
             files = fields[3:-2]
-            bytes = eval(fields[n-2])
+            bytes = int(fields[n-2])
             if user == thisuser:
-                userseen = 1
+                userseen = True
             elif not userseen:
-                aheadbytes = aheadbytes + bytes
-                aheadjobs = aheadjobs + 1
-            totalbytes = totalbytes + bytes
-            totaljobs = totaljobs + 1
-            if user in users:
-                ujobs, ubytes = users[user]
-            else:
-                ujobs, ubytes = 0, 0
-            ujobs = ujobs + 1
-            ubytes = ubytes + bytes
+                aheadbytes += bytes
+                aheadjobs += 1
+            totalbytes += bytes
+            totaljobs += 1
+            ujobs, ubytes = users.get(user, (0, 0))
+            ujobs += 1
+            ubytes += bytes
             users[user] = ujobs, ubytes
         else:
             if fields and fields[0] != 'Rank':
-                line = string.strip(line)
+                line = line.strip()
                 if line == 'no entries':
                     line = name + ': idle'
                 elif line[-22:] == ' is ready and printing':
                     line = name
                 lines.append(line)
-    #
+
     if totaljobs:
-        line = '%d K' % ((totalbytes+1023)//1024)
+        line = '%d K' % ((totalbytes+1023) // 1024)
         if totaljobs != len(users):
-            line = line + ' (%d jobs)' % totaljobs
+            line += ' (%d jobs)' % totaljobs
         if len(users) == 1:
-            line = line + ' for %s' % (list(users.keys())[0],)
+            line += ' for %s' % next(iter(users))
         else:
-            line = line + ' for %d users' % len(users)
+            line += ' for %d users' % len(users)
             if userseen:
                 if aheadjobs == 0:
-                    line =  line + ' (%s first)' % thisuser
+                    line += ' (%s first)' % thisuser
                 else:
-                    line = line + ' (%d K before %s)' % (
-                                   (aheadbytes+1023)//1024, thisuser)
+                    line += ' (%d K before %s)' % (
+                        (aheadbytes+1023) // 1024, thisuser)
         lines.append(line)
-    #
+
     sts = pipe.close()
     if sts:
         lines.append('lpq exit status %r' % (sts,))
-    return string.joinfields(lines, ': ')
+    return ': '.join(lines)
 
 if __name__ == "__main__":
     try:
diff --git a/Demo/scripts/queens.py b/Demo/scripts/queens.py
index 820c9ad..726433c 100755
--- a/Demo/scripts/queens.py
+++ b/Demo/scripts/queens.py
@@ -19,8 +19,8 @@
 
     def reset(self):
         n = self.n
-        self.y = [None]*n               # Where is the queen in column x
-        self.row = [0]*n                # Is row[y] safe?
+        self.y = [None] * n             # Where is the queen in column x
+        self.row = [0] * n              # Is row[y] safe?
         self.up = [0] * (2*n-1)         # Is upward diagonal[x-y] safe?
         self.down = [0] * (2*n-1)       # Is downward diagonal[x+y] safe?
         self.nfound = 0                 # Instrumentation
@@ -50,7 +50,7 @@
         self.up[x-y] = 0
         self.down[x+y] = 0
 
-    silent = 0                          # If set, count solutions only
+    silent = 0                          # If true, count solutions only
 
     def display(self):
         self.nfound = self.nfound + 1