minor cleanup w/ chases's feedback from CL 6665018.

git_cl/git_cl.py

 #!/usr/bin/python
 # git-cl -- a git-command for integrating reviews on Rietveld
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
 import errno
 import logging
 import optparse
 import os
 import re
 import StringIO
@@ skipping 723 matching lines @@
 
 
 def RunHook(committing, upstream_branch, rietveld_server, tbr, may_prompt):
   """Calls sys.exit() if the hook fails; returns a HookResults otherwise."""
   import presubmit_support
   import scm
   import watchlists
 
   root = RunCommand(['git', 'rev-parse', '--show-cdup']).strip()
   if not root:
-    root = "."
+    root = '.'
   absroot = os.path.abspath(root)
   if not root:
-    raise Exception("Could not get root directory.")
+    raise Exception('Could not get root directory.')
 
   # We use the sha1 of HEAD as a name of this change.
   name = RunCommand(['git', 'rev-parse', 'HEAD']).strip()
   files = scm.GIT.CaptureStatus([root], upstream_branch)
 
   cl = Changelist()
   issue = ConvertToInteger(cl.GetIssue())
   patchset = ConvertToInteger(cl.GetPatchset())
   if issue:
     description = cl.GetDescription()
   else:
     # If the change was never uploaded, use the log messages of all commits
     # up to the branch point, as git cl upload will prefill the description
     # with these log messages.
     description = RunCommand(['git', 'log', '--pretty=format:%s%n%n%b',
-                             '%s...' % (upstream_branch)]).strip()
+                              '%s...' % (upstream_branch)]).strip()
   change = presubmit_support.GitChange(name, description, absroot, files,
                                        issue, patchset)
 
   # Apply watchlists on upload.
   if not committing:
     watchlist = watchlists.Watchlists(change.RepositoryRoot())
     files = [f.LocalPath() for f in change.AffectedFiles()]
     watchers = watchlist.GetWatchersForPaths(files)
     RunCommand(['git', 'config', '--replace-all',
-               'rietveld.extracc', ','.join(watchers)])
+                'rietveld.extracc', ','.join(watchers)])
 
   output = StringIO.StringIO()
   should_continue = presubmit_support.DoPresubmitChecks(change, committing,
       verbose=None, output_stream=output, input_stream=sys.stdin,
       default_presubmit=None, may_prompt=False, tbr=tbr,
       host_url=cl.GetRietveldServer())
   hook_results = HookResults(output.getvalue())
   if hook_results.output:
     print hook_results.output
 
@@ skipping 624 matching lines @@
             ('AppEngine is misbehaving and returned HTTP %d, again. Keep faith '
              'and retry or visit go/isgaeup.\n%s') % (e.code, str(e)))
 
   # Not a known command. Default to help.
   GenUsage(parser, 'help')
   return CMDhelp(parser, argv)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))