def add_auth_id(self, auth_id):
        """A helper method to add additional auth ids to a User

        :param auth_id:
            String representing a unique id for the user. Examples:

            - own:username
            - google:username
        :returns:
            A tuple (boolean, info). The boolean indicates if the user
            was saved. If creation succeeds, ``info`` is the user entity;
            otherwise it is a list of duplicated unique properties that
            caused creation to fail.
        """
        self.auth_ids.append(auth_id)
        unique = (self.__class__.__name__, auth_id) % '%s.auth_id:%s'
        ok = self.unique_model.create(unique)
        if ok:
            self.put()
            return True, self
        else:
            return False, ['auth_id']
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/webapp2-2.5.1/webapp2_extras/appengine/auth/models.py/User.add_auth_id/swapped operands of `%`