Cleanup pylint errors

test/win/gyptest-link-base-address.py

 #!/usr/bin/env python
 
 # Copyright 2013 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.
 
 """
 Make sure the base address setting is extracted properly.
 """
 
 import TestGyp
 
 import re
 import sys
 
 if sys.platform == 'win32':
   test = TestGyp.TestGyp(formats=['msvs', 'ninja'])
 
   CHDIR = 'linker-flags'
   test.run_gyp('base-address.gyp', chdir=CHDIR)
   test.build('base-address.gyp', test.ALL, chdir=CHDIR)
 
   def GetHeaders(exe):
     full_path = test.built_file_path(exe, chdir=CHDIR)
     return test.run_dumpbin('/headers', full_path)
 
   # Extract the image base address from the headers output.
-  image_base_reg_ex = re.compile('.*\s+([0-9]+) image base.*', re.DOTALL)
+  image_base_reg_ex = re.compile(r'.*\s+([0-9]+) image base.*', re.DOTALL)
 
   exe_headers = GetHeaders('test_base_specified_exe.exe')
   exe_match = image_base_reg_ex.match(exe_headers)
 
   if not exe_match or not exe_match.group(1):
     test.fail_test()
   if exe_match.group(1) != '420000':
     test.fail_test()
 
   dll_headers = GetHeaders('test_base_specified_dll.dll')
@@ skipping 14 matching lines @@
 
   default_dll_headers = GetHeaders('test_base_default_dll.dll')
   default_dll_match = image_base_reg_ex.match(default_dll_headers)
 
   if not default_dll_match or not default_dll_match.group(1):
     test.fail_test()
   if default_dll_match.group(1) != '10000000':
     test.fail_test()
 
   test.pass_test()