Add a warning if the current version of python is not 2.5

presubmit_support.py

-#!/usr/bin/python
-# Copyright (c) 2010 The Chromium Authors. All rights reserved.
+#!/usr/bin/env python
+# Copyright (c) 2011 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.
 
 """Enables directory-specific presubmit checks to run at upload and/or commit.
 """
 
 __version__ = '1.5'
 
 # TODO(joi) Add caching where appropriate/needed. The API is designed to allow
 # caching (between all different invocations of presubmit scripts for a given
@@ skipping 18 matching lines @@
 import traceback  # Exposed through the API.
 import types
 import unittest  # Exposed through the API.
 import urllib2  # Exposed through the API.
 from warnings import warn
 
 try:
   import simplejson as json  # pylint: disable=F0401
 except ImportError:
   try:
-    import json
-    # Some versions of python2.5 have an incomplete json module.  Check to make
-    # sure loads exists.
-    # Statement seems to have no effect
-    # pylint: disable=W0104
-    json.loads
-  except (ImportError, AttributeError):
+    import json  # pylint: disable=F0401
+  except ImportError:
     # Import the one included in depot_tools.
     sys.path.append(os.path.join(os.path.dirname(__file__), 'third_party'))
     import simplejson as json  # pylint: disable=F0401
 
 # Local imports.
 import fix_encoding
 import gclient_utils
 import owners
 import presubmit_canned_checks
 import scm
@@ skipping 1139 matching lines @@
                               sys.stdout,
                               sys.stdin,
                               options.default_presubmit,
                               options.may_prompt)
   return not results.should_continue()
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   sys.exit(Main(None))