Cleanup pylint errors

tools/pretty_sln.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 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.
 
 """Prints the information in a sln file in a diffable way.
 
    It first outputs each projects in alphabetical order with their
    dependencies.
@@ skipping 20 matching lines @@
 
 def ParseSolution(solution_file):
   # All projects, their clsid and paths.
   projects = dict()
 
   # A list of dependencies associated with a project.
   dependencies = dict()
 
   # Regular expressions that matches the SLN format.
   # The first line of a project definition.
-  begin_project = re.compile(('^Project\("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942'
-                              '}"\) = "(.*)", "(.*)", "(.*)"$'))
+  begin_project = re.compile(r'^Project\("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942'
+                             r'}"\) = "(.*)", "(.*)", "(.*)"$')
   # The last line of a project definition.
   end_project = re.compile('^EndProject$')
   # The first line of a dependency list.
-  begin_dep = re.compile('ProjectSection\(ProjectDependencies\) = postProject$')
+  begin_dep = re.compile(
+      r'ProjectSection\(ProjectDependencies\) = postProject$')
   # The last line of a dependency list.
   end_dep = re.compile('EndProjectSection$')
   # A line describing a dependency.
   dep_line = re.compile(' *({.*}) = ({.*})$')
 
   in_deps = False
   solution = open(solution_file)
   for line in solution:
     results = begin_project.search(line)
     if results:
@@ skipping 102 matching lines @@
   PrintDependencies(projects, deps)
   PrintBuildOrder(projects, deps)
 
   if '--recursive' in sys.argv:
     PrintVCProj(projects)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())