code: def save_to_well_known_file(credentials, well_known_file=None):
      
      # TODO(orestica): move this method to tools.py
      # once the argparse import gets fixed (it is not present in Python 2.6)
  
      if well_known_file is None:
          well_known_file = _get_well_known_file()
  
      config_dir = os.path.dirname(well_known_file)
      if not os.path.isdir(config_dir):
          raise OSError(
              'Config directory does not exist: {0}'.format(config_dir))
  
      credentials_data = credentials.serialization_data
      _save_private_file(well_known_file, credentials_data)
docs: Save the provided GoogleCredentials to the well known file.
  
      Args:
          credentials: the credentials to be saved to the well known file;
                       it should be an instance of GoogleCredentials
          well_known_file: the name of the file where the credentials are to be
                           saved; this parameter is supposed to be used for
                           testing only