Creates an AdWordsClient with information stored in a yaml file.

    Args:
      [optional]
      path: The path string to the file containing cached AdWords data.

    Returns:
      An AdWordsClient initialized with the values cached in the file.

    Raises:
      A GoogleAdsValueError if the given yaml file does not contain the
      information necessary to instantiate a client object - either a
      required key was missing or an OAuth2 key was missing.

def LoadFromStorage(cls, path=None):
    """Creates an AdWordsClient with information stored in a yaml file.

    Args:
      [optional]
      path: The path string to the file containing cached AdWords data.

    Returns:
      An AdWordsClient initialized with the values cached in the file.

    Raises:
      A GoogleAdsValueError if the given yaml file does not contain the
      information necessary to instantiate a client object - either a
      required key was missing or an OAuth2 key was missing.
    """
    if path is None:
      path = os.path.join(os.path.expanduser('~'), 'googleads.yaml')

    return cls(**googleads.common.LoadFromStorage(
        path, cls._YAML_KEY, cls._REQUIRED_INIT_VALUES,
        cls._OPTIONAL_INIT_VALUES))