app_engine.py 文件源码

def __init__(self, scopes=None, service_account_id=None):
        """
        Args:
            scopes (Sequence[str]): Scopes to request from the App Identity
                API.
            service_account_id (str): The service account ID passed into
                :func:`google.appengine.api.app_identity.get_access_token`.
                If not specified, the default application service account
                ID will be used.

        Raises:
            EnvironmentError: If the App Engine APIs are unavailable.
        """
        # pylint: disable=missing-raises-doc
        # Pylint rightfully thinks EnvironmentError is OSError, but doesn't
        # realize it's a valid alias.
        if app_identity is None:
            raise EnvironmentError(
                'The App Engine APIs are not available.')

        super(Credentials, self).__init__()
        self._scopes = scopes
        self._service_account_id = service_account_id
        self._signer = Signer()