diff --git a/Demo/cgi/wiki.py b/Demo/cgi/wiki.py
index ee094a8..2f944d6 100644
--- a/Demo/cgi/wiki.py
+++ b/Demo/cgi/wiki.py
@@ -119,5 +119,5 @@
                 f.write('\n')
             f.close()
             return ""
-        except IOError, err:
+        except IOError as err:
             return "IOError: %s" % str(err)
diff --git a/Demo/comparisons/regextest.py b/Demo/comparisons/regextest.py
index b27d741..1fab052 100755
--- a/Demo/comparisons/regextest.py
+++ b/Demo/comparisons/regextest.py
@@ -28,7 +28,7 @@
     for file in sys.argv[1:]:
         try:
             fp = open(file, 'r')
-        except IOError, msg:
+        except IOError as msg:
             print "%s: %s" % (file, msg)
             continue
         lineno = 0
diff --git a/Demo/comparisons/systemtest.py b/Demo/comparisons/systemtest.py
index bbc313b..d3fc72b 100755
--- a/Demo/comparisons/systemtest.py
+++ b/Demo/comparisons/systemtest.py
@@ -41,7 +41,7 @@
 def reportboguslinks(prefix):
     try:
         names = os.listdir('.')
-    except os.error, msg:
+    except os.error as msg:
         print "%s%s: can't list: %s" % (prefix, '.', msg)
         return
     names.sort()
@@ -62,7 +62,7 @@
         elif S_ISDIR(mode):
             try:
                 os.chdir(name)
-            except os.error, msg:
+            except os.error as msg:
                 print "%s%s: can't chdir: %s" % \
                       (prefix, name, msg)
                 continue
diff --git a/Demo/parser/test_parser.py b/Demo/parser/test_parser.py
index be39bca..1589f3b 100755
--- a/Demo/parser/test_parser.py
+++ b/Demo/parser/test_parser.py
@@ -17,7 +17,7 @@
         # against a large source file like Tkinter.py.
         ast = None
         new = parser.tuple2ast(tup)
-    except parser.ParserError, err:
+    except parser.ParserError as err:
         print
         print 'parser module raised exception on input file', fileName + ':'
         traceback.print_exc()
diff --git a/Demo/parser/unparse.py b/Demo/parser/unparse.py
index 32acbed..1c6e933 100644
--- a/Demo/parser/unparse.py
+++ b/Demo/parser/unparse.py
@@ -492,7 +492,7 @@
                 print 'Testing %s' % fullname
                 try:
                     roundtrip(fullname, output)
-                except Exception, e:
+                except Exception as 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 a1ab635..dad4015 100755
--- a/Demo/pdist/FSProxy.py
+++ b/Demo/pdist/FSProxy.py
@@ -87,7 +87,7 @@
                     fs = macfs.FSSpec(name)
                     c, t = fs.GetCreatorType()
                     if t != 'TEXT': return 0
-                except macfs.error, msg:
+                except macfs.error as msg:
                     print "***", name, msg
                     return 0
         else:
diff --git a/Demo/pdist/cmdfw.py b/Demo/pdist/cmdfw.py
index e2edd0a..47d13bc 100755
--- a/Demo/pdist/cmdfw.py
+++ b/Demo/pdist/cmdfw.py
@@ -42,7 +42,7 @@
         if args is None: args = sys.argv[1:]
         try:
             opts, args = getopt.getopt(args, self.GlobalFlags)
-        except getopt.error, msg:
+        except getopt.error as msg:
             return self.usage(msg)
         self.options(opts)
         if not args:
@@ -62,7 +62,7 @@
                 flags = ''
             try:
                 opts, args = getopt.getopt(args[1:], flags)
-            except getopt.error, msg:
+            except getopt.error as msg:
                 return self.usage(
                         "subcommand %s: " % cmd + str(msg))
             self.ready()
diff --git a/Demo/pdist/cmptree.py b/Demo/pdist/cmptree.py
index fa06f5f..5031869 100755
--- a/Demo/pdist/cmptree.py
+++ b/Demo/pdist/cmptree.py
@@ -135,7 +135,7 @@
 def sendfile(local, remote, name):
     try:
         remote.create(name)
-    except (IOError, os.error), msg:
+    except (IOError, os.error) as msg:
         print "cannot create:", msg
         return
 
@@ -171,7 +171,7 @@
 def recvfile_real(local, remote, name):
     try:
         local.create(name)
-    except (IOError, os.error), msg:
+    except (IOError, os.error) as msg:
         print "cannot create:", msg
         return
 
diff --git a/Demo/pdist/cvslock.py b/Demo/pdist/cvslock.py
index 8f6d008..6484e71 100755
--- a/Demo/pdist/cvslock.py
+++ b/Demo/pdist/cvslock.py
@@ -129,7 +129,7 @@
                 self.lockdir = self.cvslck
                 os.mkdir(self.cvslck, 0777)
                 return
-            except os.error, msg:
+            except os.error as msg:
                 self.lockdir = None
                 if msg[0] == EEXIST:
                     try:
@@ -234,7 +234,7 @@
         for r in repositories:
             try:
                 locks.append(WriteLock(r, 0))
-            except Locked, instance:
+            except Locked as instance:
                 del locks
                 break
         else:
diff --git a/Demo/pdist/rrcs.py b/Demo/pdist/rrcs.py
index 4d23e6c..540d296 100755
--- a/Demo/pdist/rrcs.py
+++ b/Demo/pdist/rrcs.py
@@ -22,7 +22,7 @@
             raise getopt.error, "unknown command"
         coptset, func = commands[cmd]
         copts, files = getopt.getopt(rest, coptset)
-    except getopt.error, msg:
+    except getopt.error as msg:
         print msg
         print "usage: rrcs [options] command [options] [file] ..."
         print "where command can be:"
@@ -41,7 +41,7 @@
     for fn in files:
         try:
             func(x, copts, fn)
-        except (IOError, os.error), msg:
+        except (IOError, os.error) as msg:
             print "%s: %s" % (fn, msg)
 
 def checkin(x, copts, fn):
diff --git a/Demo/pysvr/pysvr.py b/Demo/pysvr/pysvr.py
index 3b692b3..b1b7565 100755
--- a/Demo/pysvr/pysvr.py
+++ b/Demo/pysvr/pysvr.py
@@ -21,14 +21,14 @@
         opts, args = getopt.getopt(sys.argv[1:], "")
         if len(args) > 1:
             raise getopt.error, "Too many arguments."
-    except getopt.error, msg:
+    except getopt.error as msg:
         usage(msg)
     for o, a in opts:
         pass
     if args:
         try:
             port = string.atoi(args[0])
-        except ValueError, msg:
+        except ValueError as msg:
             usage(msg)
     else:
         port = PORT
@@ -83,7 +83,7 @@
         source = source + line
         try:
             code = compile_command(source)
-        except SyntaxError, err:
+        except SyntaxError as err:
             source = ""
             traceback.print_exception(SyntaxError, err, None, file=stdout)
             continue
@@ -92,7 +92,7 @@
         source = ""
         try:
             run_command(code, stdin, stdout, globals)
-        except SystemExit, how:
+        except SystemExit as how:
             if how:
                 try:
                     how = str(how)
@@ -109,7 +109,7 @@
         sys.stdin = stdin
         try:
             exec(code, globals)
-        except SystemExit, how:
+        except SystemExit as how:
             raise SystemExit, how, sys.exc_info()[2]
         except:
             type, value, tb = sys.exc_info()
diff --git a/Demo/rpc/nfsclient.py b/Demo/rpc/nfsclient.py
index 8e5a199..3890aff 100644
--- a/Demo/rpc/nfsclient.py
+++ b/Demo/rpc/nfsclient.py
@@ -194,8 +194,7 @@
     fh = sf[1]
     if fh:
         ncl = NFSClient(host)
-        as = ncl.Getattr(fh)
-        print as
+        print ncl.Getattr(fh)
         list = ncl.Listdir(fh)
         for item in list: print item
         mcl.Umnt(filesys)
diff --git a/Demo/rpc/rpc.py b/Demo/rpc/rpc.py
index 141fe09..f7231c1 100644
--- a/Demo/rpc/rpc.py
+++ b/Demo/rpc/rpc.py
@@ -330,7 +330,8 @@
         try:
             sock.bind((host, i))
             return last_resv_port_tried
-        except socket.error, (errno, msg):
+        except socket.error as e:
+            (errno, msg) = e
             if errno != 114:
                 raise socket.error, (errno, msg)
     raise RuntimeError, 'can\'t assign reserved port'
@@ -765,7 +766,7 @@
                 call = recvrecord(sock)
             except EOFError:
                 break
-            except socket.error, msg:
+            except socket.error as msg:
                 print 'socket error:', msg
                 break
             reply = self.handle(call)
@@ -866,7 +867,7 @@
     s = S('', 0x20000000, 1, 0)
     try:
         s.unregister()
-    except RuntimeError, msg:
+    except RuntimeError as msg:
         print 'RuntimeError:', msg, '(ignored)'
     s.register()
     print 'Service started...'
diff --git a/Demo/scripts/eqfix.py b/Demo/scripts/eqfix.py
index 35c43aa..497ab20 100755
--- a/Demo/scripts/eqfix.py
+++ b/Demo/scripts/eqfix.py
@@ -62,7 +62,7 @@
     bad = 0
     try:
         names = os.listdir(dirname)
-    except os.error, msg:
+    except os.error as msg:
         err('%s: cannot list directory: %r\n' % (dirname, msg))
         return 1
     names.sort()
@@ -83,7 +83,7 @@
 ##      dbg('fix(%r)\n' % (dirname,))
     try:
         f = open(filename, 'r')
-    except IOError, msg:
+    except IOError as msg:
         err('%s: cannot open: %r\n' % (filename, msg))
         return 1
     head, tail = os.path.split(filename)
@@ -120,7 +120,7 @@
             if g is None:
                 try:
                     g = open(tempname, 'w')
-                except IOError, msg:
+                except IOError as msg:
                     f.close()
                     err('%s: cannot create: %r\n' % (tempname, msg))
                     return 1
@@ -144,17 +144,17 @@
     try:
         statbuf = os.stat(filename)
         os.chmod(tempname, statbuf[ST_MODE] & 07777)
-    except os.error, msg:
+    except os.error as msg:
         err('%s: warning: chmod failed (%r)\n' % (tempname, msg))
     # Then make a backup of the original file as filename~
     try:
         os.rename(filename, filename + '~')
-    except os.error, msg:
+    except os.error as msg:
         err('%s: warning: backup failed (%r)\n' % (filename, msg))
     # Now move the temp file to the original file
     try:
         os.rename(tempname, filename)
-    except os.error, msg:
+    except os.error as msg:
         err('%s: rename failed (%r)\n' % (filename, msg))
         return 1
     # Return succes
diff --git a/Demo/scripts/ftpstats.py b/Demo/scripts/ftpstats.py
index 5c1599e..c7c0749 100755
--- a/Demo/scripts/ftpstats.py
+++ b/Demo/scripts/ftpstats.py
@@ -25,7 +25,7 @@
     search = None
     try:
         opts, args = getopt.getopt(sys.argv[1:], 'm:s:')
-    except getopt.error, msg:
+    except getopt.error as msg:
         print msg
         print 'usage: ftpstats [-m maxitems] [file]'
         sys.exit(2)
@@ -41,7 +41,7 @@
     else:
         try:
             f = open(file, 'r')
-        except IOError, msg:
+        except IOError as msg:
             print file, ':', msg
             sys.exit(1)
     bydate = {}
diff --git a/Demo/scripts/mboxconvert.py b/Demo/scripts/mboxconvert.py
index 8c462f3..8da37bf 100755
--- a/Demo/scripts/mboxconvert.py
+++ b/Demo/scripts/mboxconvert.py
@@ -16,7 +16,7 @@
     dofile = mmdf
     try:
         opts, args = getopt.getopt(sys.argv[1:], 'f')
-    except getopt.error, msg:
+    except getopt.error as msg:
         sys.stderr.write('%s\n' % msg)
         sys.exit(2)
     for o, a in opts:
@@ -33,7 +33,7 @@
         elif os.path.isfile(arg):
             try:
                 f = open(arg)
-            except IOError, msg:
+            except IOError as msg:
                 sys.stderr.write('%s: %s\n' % (arg, msg))
                 sts = 1
                 continue
@@ -56,7 +56,7 @@
         fn = os.path.join(dir, msg)
         try:
             f = open(fn)
-        except IOError, msg:
+        except IOError as msg:
             sys.stderr.write('%s: %s\n' % (fn, msg))
             sts = 1
             continue
diff --git a/Demo/scripts/newslist.py b/Demo/scripts/newslist.py
index a631214..0111ace 100755
--- a/Demo/scripts/newslist.py
+++ b/Demo/scripts/newslist.py
@@ -330,7 +330,7 @@
         else:
             s = NNTP(newshost)
         connected = 1
-    except (nntplib.error_temp, nntplib.error_perm), x:
+    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.'
         connected = 0
diff --git a/Demo/scripts/pp.py b/Demo/scripts/pp.py
index 0491fa9..2530ea3 100755
--- a/Demo/scripts/pp.py
+++ b/Demo/scripts/pp.py
@@ -35,7 +35,7 @@
 
 try:
     optlist, ARGS = getopt.getopt(sys.argv[1:], 'acde:F:np')
-except getopt.error, msg:
+except getopt.error as msg:
     sys.stderr.write(sys.argv[0] + ': ' + msg + '\n')
     sys.exit(2)
 
diff --git a/Demo/scripts/update.py b/Demo/scripts/update.py
index eac1a22..a965e4a 100755
--- a/Demo/scripts/update.py
+++ b/Demo/scripts/update.py
@@ -19,7 +19,7 @@
         self.changed = 0
         try:
             self.lines = open(filename, 'r').readlines()
-        except IOError, msg:
+        except IOError as msg:
             print '*** Can\'t open "%s":' % filename, msg
             self.lines = None
             return
@@ -32,7 +32,7 @@
         try:
             os.rename(self.filename, self.filename + '~')
             fp = open(self.filename, 'w')
-        except (os.error, IOError), msg:
+        except (os.error, IOError) as msg:
             print '*** Can\'t rewrite "%s":' % self.filename, msg
             return
         print 'writing', self.filename
@@ -67,7 +67,7 @@
     if sys.argv[1:]:
         try:
             fp = open(sys.argv[1], 'r')
-        except IOError, msg:
+        except IOError as msg:
             print 'Can\'t open "%s":' % sys.argv[1], msg
             sys.exit(1)
     else:
diff --git a/Demo/sockets/gopher.py b/Demo/sockets/gopher.py
index 2c46da6..0635ac1 100755
--- a/Demo/sockets/gopher.py
+++ b/Demo/sockets/gopher.py
@@ -142,7 +142,7 @@
         raise RuntimeError, 'too many args'
     try:
         browse_menu(selector, host, port)
-    except socket.error, msg:
+    except socket.error as msg:
         print 'Socket error:', msg
         sys.exit(1)
     except KeyboardInterrupt:
@@ -202,7 +202,7 @@
         p = os.popen('${PAGER-more}', 'w')
         x = SaveLines(p)
         get_alt_textfile(selector, host, port, x.writeln)
-    except IOError, msg:
+    except IOError as msg:
         print 'IOError:', msg
     if x:
         x.close()
@@ -213,7 +213,7 @@
     try:
         get_alt_textfile(selector, host, port, x.writeln)
         print 'Done.'
-    except IOError, msg:
+    except IOError as msg:
         print 'IOError:', msg
     x.close()
 
@@ -311,7 +311,7 @@
         cmd = savefile[1:].strip()
         try:
             p = os.popen(cmd, 'w')
-        except IOError, msg:
+        except IOError as msg:
             print repr(cmd), ':', msg
             return None
         print 'Piping through', repr(cmd), '...'
@@ -320,7 +320,7 @@
         savefile = os.path.expanduser(savefile)
     try:
         f = open(savefile, 'w')
-    except IOError, msg:
+    except IOError as msg:
         print repr(savefile), ':', msg
         return None
     print 'Saving to', repr(savefile), '...'
diff --git a/Demo/sockets/telnet.py b/Demo/sockets/telnet.py
index d50c37f..6bc9bcc 100755
--- a/Demo/sockets/telnet.py
+++ b/Demo/sockets/telnet.py
@@ -52,7 +52,7 @@
     #
     try:
         s.connect((host, port))
-    except error, msg:
+    except error as msg:
         sys.stderr.write('connect failed: ' + repr(msg) + '\n')
         sys.exit(1)
     #
diff --git a/Demo/threads/find.py b/Demo/threads/find.py
index 14148b8..68ca155 100644
--- a/Demo/threads/find.py
+++ b/Demo/threads/find.py
@@ -131,7 +131,7 @@
 def find(dir, pred, wq):
     try:
         names = os.listdir(dir)
-    except os.error, msg:
+    except os.error as msg:
         print repr(dir), ':', msg
         return
     for name in names:
@@ -139,7 +139,7 @@
             fullname = os.path.join(dir, name)
             try:
                 stat = os.lstat(fullname)
-            except os.error, msg:
+            except os.error as msg:
                 print repr(fullname), ':', msg
                 continue
             if pred(dir, name, fullname, stat):
diff --git a/Demo/threads/telnet.py b/Demo/threads/telnet.py
index 707a353..09f3bd9 100644
--- a/Demo/threads/telnet.py
+++ b/Demo/threads/telnet.py
@@ -56,7 +56,7 @@
     #
     try:
         s.connect((host, port))
-    except error, msg:
+    except error as msg:
         sys.stderr.write('connect failed: %r\n' % (msg,))
         sys.exit(1)
     #
diff --git a/Demo/tkinter/guido/AttrDialog.py b/Demo/tkinter/guido/AttrDialog.py
index 9fa699e..d8b2571 100755
--- a/Demo/tkinter/guido/AttrDialog.py
+++ b/Demo/tkinter/guido/AttrDialog.py
@@ -156,7 +156,7 @@
             self.current = self.var.get()
             try:
                 self.dialog.widget.pack(**{self.option: self.current})
-            except TclError, msg:
+            except TclError as msg:
                 print msg
                 self.refresh()
 
@@ -212,7 +212,7 @@
                                      'pack',
                                      'info',
                                      self.widget))
-        except TclError, msg:
+        except TclError as msg:
             print msg
             return
         dict = {}
@@ -239,7 +239,7 @@
                         '-'+self.option,
                         self.dialog.master.tk.merge(
                                 self.current))
-            except TclError, msg:
+            except TclError as msg:
                 print msg
                 self.refresh()
 
@@ -285,7 +285,7 @@
             self.current = self.var.get()
             try:
                 self.dialog.widget[self.option] = self.current
-            except TclError, msg:
+            except TclError as msg:
                 print msg
                 self.refresh()
 
@@ -374,7 +374,7 @@
                     self.master.send(self.app,
                                      self.widget,
                                      'config'))
-        except TclError, msg:
+        except TclError as msg:
             print msg
             return
         dict = {}
@@ -398,7 +398,7 @@
                         'config',
                         '-'+self.option,
                         self.current)
-            except TclError, msg:
+            except TclError as msg:
                 print msg
                 self.refresh()
 
@@ -445,7 +445,7 @@
         if widget == '.': continue
         try:
             RemotePackDialog(list, list.app, widget)
-        except TclError, msg:
+        except TclError as msg:
             print msg
 
 test()
diff --git a/Demo/tkinter/guido/ManPage.py b/Demo/tkinter/guido/ManPage.py
index 221af88..b189b64 100755
--- a/Demo/tkinter/guido/ManPage.py
+++ b/Demo/tkinter/guido/ManPage.py
@@ -95,7 +95,7 @@
             self._parseline('')
         try:
             self.tk.deletefilehandler(self.fp)
-        except TclError, msg:
+        except TclError as msg:
             pass
         self.fp.close()
         self.fp = None
diff --git a/Demo/tkinter/guido/mbox.py b/Demo/tkinter/guido/mbox.py
index 3c36d88..47c38b9 100755
--- a/Demo/tkinter/guido/mbox.py
+++ b/Demo/tkinter/guido/mbox.py
@@ -27,7 +27,7 @@
     seq = 'all'
     try:
         opts, args = getopt.getopt(sys.argv[1:], '')
-    except getopt.error, msg:
+    except getopt.error as msg:
         print msg
         sys.exit(2)
     for arg in args:
diff --git a/Demo/tkinter/guido/tkman.py b/Demo/tkinter/guido/tkman.py
index 6b0b641..810bdf8 100755
--- a/Demo/tkinter/guido/tkman.py
+++ b/Demo/tkinter/guido/tkman.py
@@ -216,7 +216,7 @@
                 prog = re.compile(search, map)
             else:
                 prog = re.compile(search)
-        except re.error, msg:
+        except re.error as msg:
             self.frame.bell()
             print 'Regex error:', msg
             return
diff --git a/Demo/tkinter/guido/wish.py b/Demo/tkinter/guido/wish.py
index 35e012c..2367e25 100755
--- a/Demo/tkinter/guido/wish.py
+++ b/Demo/tkinter/guido/wish.py
@@ -23,7 +23,7 @@
         tk.record(line)
         try:
             result = tk.call('eval', cmd)
-        except _tkinter.TclError, msg:
+        except _tkinter.TclError as msg:
             print 'TclError:', msg
         else:
             if result: print result