Cleanup pylint errors

test/lib/TestWin.py

 # Copyright (c) 2014 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 TestWin.py:  a collection of helpers for testing on Windows.
 """
 
 import errno
 import os
@@ skipping 26 matching lines @@
     p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     # Get the stdout from reg.exe, reading to the end so p.returncode is valid
     # Note that the error text may be in [1] in some cases
     text = p.communicate()[0]
     # Check return code from reg.exe; officially 0==success and 1==error
     if p.returncode:
       return None
     return text
 
   def Query(self, key, value=None):
-    """Use reg.exe to read a particular key through _QueryBase.
+    r"""Use reg.exe to read a particular key through _QueryBase.
 
     First tries to launch from %WinDir%\Sysnative to avoid WoW64 redirection. If
     that fails, it falls back to System32.  Sysnative is available on Vista and
     up and available on Windows Server 2003 and XP through KB patch 942589. Note
     that Sysnative will always fail if using 64-bit python due to it being a
     virtual directory and System32 will work correctly in the first place.
 
     KB 942589 - http://support.microsoft.com/kb/942589/en-us.
 
     Arguments:
@@ skipping 34 matching lines @@
     """Use reg.exe to see if a key exists.
 
     Args:
       key: The registry key to check.
     Return:
       True if the key exists
     """
     if not self.Query(key):
       return False
     return True