Largely reduce the number of pylint warnings and fix one typo.

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
 import errno
 import getpass
 import logging
 import optparse
 import os
 import posixpath
 import re
 import shutil
 import sys
 import tempfile
 import urllib
 
 try:
   import simplejson as json
 except ImportError:
   try:
     import json
   except ImportError:
     json = None
 
 try:
-  import breakpad
+  import breakpad  # pylint: disable=W0611
 except ImportError:
   pass
 
 try:
   import gcl
 except ImportError:
   gcl = None
 
 import gclient_utils
 import scm
@@ skipping 155 matching lines @@
       # Assumes the svn credential is an email address.
       self.options.email = scm.SVN.GetEmail(self.checkout_root)
     logging.info("SVN(%s)" % self.checkout_root)
 
   def ReadRootFile(self, filename):
     data = SCM.ReadRootFile(self, filename)
     if data:
       return data
 
     # Try to search on the subversion repository for the file.
-    try:
-      from gcl import GetCachedFile
-    except ImportError:
+    if not gcl:
       return None
-    data = GetCachedFile(filename)
+    data = gcl.GetCachedFile(filename)
     logging.debug('%s:\n%s' % (filename, data))
     return data
 
   def GenerateDiff(self):
     """Returns a string containing the diff for the given file list.
 
     The files in the list should either be absolute paths or relative to the
     given root.
     """
     if not self.files:
@@ skipping 537 matching lines @@
     print >> sys.stderr, e
     return 1
   except gclient_utils.Error, e:
     print >> sys.stderr, e
     return 1
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(TryChange(None, [], False))