code: def _ReadAppJsonFile(self, relative_path):
      
      try:
        with open(os.path.join(sys.path[0], relative_path), 'r') as f:
          return json.load(f)
      except (IOError, ValueError):
        return None
docs: Reads JSON file from an application directory.
  
      Args:
        relative_path: file name relative to application root directory.
  
      Returns:
        Parsed JSON data or None if the file does not exist, can't be read or
        not a valid JSON file.