def has_parent(cls, obj, key, optimistic=False):
    manager = manager_of_class(cls)
    state = instance_state(obj)
    return manager.has_parent(state, key, optimistic)
IPv6 L{Server} instances have a string representation indicating on
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py/has_parent--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/internet/test/test_tcp.py/TCPTransportServerAddressTestMixin.test_serverAddressTCP6