def __init__(cls, classname, bases, dict_):
        if '_decl_class_registry' not in cls.__dict__:
            _as_declarative(cls, classname, cls.__dict__)
        type.__init__(cls, classname, bases, dict_)
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/ext/declarative/api.py/DeclarativeMeta.__init__/original