Correct invalid use of 'is' when '==' should have been used.

gclient.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Meta checkout manager supporting both Subversion and GIT.
 
 Files
   .gclient      : Current client configuration, written by 'config' command.
                   Format is a Python script defining 'solutions', a list whose
@@ skipping 556 matching lines @@
       for i in range(len(file_list)):
         # It depends on the command being executed (like runhooks vs sync).
         if not os.path.isabs(file_list[i]):
           continue
         prefix = os.path.commonprefix(
             [self.root.root_dir.lower(), file_list[i].lower()])
         file_list[i] = file_list[i][len(prefix):]
         # Strip any leading path separators.
         while file_list[i].startswith(('\\', '/')):
           file_list[i] = file_list[i][1:]
-    elif command is 'recurse':
+    elif command == 'recurse':
       if not isinstance(parsed_url, self.FileImpl):
         # Skip file only checkout.
         scm = gclient_scm.GetScmName(parsed_url)
         if not options.scm or scm in options.scm:
           cwd = os.path.normpath(os.path.join(self.root.root_dir, self.name))
           # Pass in the SCM type as an env variable
           env = os.environ.copy()
           if scm:
             env['GCLIENT_SCM'] = scm
           if parsed_url:
@@ skipping 423 matching lines @@
     revision_overrides = {}
     # It's unnecessary to check for revision overrides for 'recurse'.
     # Save a few seconds by not calling _EnforceRevisions() in that case.
     if command not in ('diff', 'recurse', 'runhooks', 'status'):
       revision_overrides = self._EnforceRevisions()
     pm = None
     # Disable progress for non-tty stdout.
     if (sys.stdout.isatty() and not self._options.verbose):
       if command in ('update', 'revert'):
         pm = Progress('Syncing projects', 1)
-      elif command is 'recurse':
+      elif command == 'recurse':
         pm = Progress(' '.join(args), 1)
     work_queue = gclient_utils.ExecutionQueue(self._options.jobs, pm)
     for s in self.dependencies:
       work_queue.enqueue(s)
     work_queue.flush(revision_overrides, command, args, options=self._options)
 
     # Once all the dependencies have been processed, it's now safe to run the
     # hooks.
     if not self._options.nohooks:
       self.RunHooksRecursively(self._options)
@@ skipping 591 matching lines @@
   except (gclient_utils.Error, subprocess2.CalledProcessError), e:
     print >> sys.stderr, 'Error: %s' % str(e)
     return 1
 
 
 if '__main__' == __name__:
   fix_encoding.fix_encoding()
   sys.exit(Main(sys.argv[1:]))
 
 # vim: ts=2:sw=2:tw=80:et: