def register_class(class_):

    manager = manager_of_class(class_)
    if manager is None:
        manager = _instrumentation_factory.create_manager_for_cls(class_)
    return manager
Register class instrumentation.
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/orm/instrumentation.py/register_class