def _attr_has_impl(self, key):
        """Return True if the given attribute is fully initialized.

        i.e. has an impl.
        """

        return key in self and self[key].impl is not None
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/orm/instrumentation.py/ClassManager._attr_has_impl/original