Certain versions of python for Windows don't support epilog in the constructor.

trychange.py

 #!/usr/bin/python
 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """Client-side script to send a try job to the try server. It communicates to
 the try server by either writting to a svn repository or by directly connecting
 to the server by HTTP.
 """
 
 import datetime
@@ skipping 440 matching lines @@
               swallow_exception,
               prog=None,
               extra_epilog=None):
   """
   Args:
     argv: Arguments and options.
     file_list: Default value to pass to --file.
     swallow_exception: Whether we raise or swallow exceptions.
   """
   # Parse argv
+  parser = optparse.OptionParser(usage=USAGE,
+                                 version=__version__,
+                                 prog=prog)
   epilog = EPILOG % { 'prog': prog }
   if extra_epilog:
     epilog += extra_epilog
-  parser = optparse.OptionParser(usage=USAGE,
-                                 version=__version__,
-                                 prog=prog,
-                                 epilog=epilog)
+  parser.epilog = epilog
   # Remove epilog formatting
   parser.format_epilog = lambda x: parser.epilog
   parser.add_option("-v", "--verbose", action="count", default=0,
                     help="Prints debugging infos")
   group = optparse.OptionGroup(parser, "Result and status")
   group.add_option("-u", "--user", default=getpass.getuser(),
                    help="Owner user name [default: %default]")
   group.add_option("-e", "--email",
                    default=os.environ.get('TRYBOT_RESULTS_EMAIL_ADDRESS',
                         os.environ.get('EMAIL_ADDRESS')),
@@ skipping 257 matching lines @@
   except (InvalidScript, NoTryServerAccess), e:
     if swallow_exception:
       return 1
     print e
     return 1
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(TryChange(None, [], False))