@abc.abstractmethod
    def list_by_instance(self, instance_id):
        pass
Required by flask_login
dataset/ETHPy150Open CiscoSystems/avos/openstack_dashboard/api/network_base.py/SecurityGroupManager.list_by_instance--crossover with--dataset/ETHPy150Open airbnb/airflow/airflow/contrib/auth/backends/ldap_auth.py/LdapUser.is_anonymous