def __ValidateAppId(self, app_id):
    """Verify that this is the stub for app_id.

    Args:
      app_id: An application ID.

    Raises:
      datastore_errors.BadRequestError: if this is not the stub for app_id.
    """
    if not self.__trusted and app_id != self.__app_id:
      raise datastore_errors.BadRequestError(
          (self.__app_id, app_id) % 'app %s cannot access app %s\'s data')
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/api/datastore_file_stub.py/DatastoreFileStub.__ValidateAppId/swapped operands of `%`