Silence pylint on Mac OSX 10.6

subprocess2.py

 # coding=utf8
 # 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.
 """Collection of subprocess wrapper functions.
 
 In theory you shouldn't need anything else in subprocess, or this module failed.
 """
 
 from __future__ import with_statement
@@ skipping 164 matching lines @@
         # Create a temporary file to workaround python's deadlock.
         # http://docs.python.org/library/subprocess.html#subprocess.Popen.wait
         # When the pipe fills up, it will deadlock this process. Using a real
         # file works around that issue.
         kwargs[stream] = open(os.devnull, 'w')
 
     fix('stdout')
     fix('stderr')
 
     self.start = time.time()
-
+    # Silence pylint on MacOSX
+    self.returncode = None
     try:
       super(Popen, self).__init__(args, **kwargs)
     except OSError, e:
       if e.errno == errno.EAGAIN and sys.platform == 'cygwin':
         # Convert fork() emulation failure into a CygwinRebaseError().
         raise CygwinRebaseError(
             e.errno,
             args,
             kwargs.get('cwd'),
             None,
@@ skipping 110 matching lines @@
 
   - Throws if return code is not 0.
   - Works even prior to python 2.7.
   - Blocks stdin by default if not specified since no output will be visible.
   - As per doc, "The stdout argument is not allowed as it is used internally."
   """
   kwargs.setdefault('stdin', VOID)
   if 'stdout' in kwargs:
     raise ValueError('stdout argument not allowed, it will be overridden.')
   return check_call_out(args, stdout=PIPE, **kwargs)[0]