def _attr_has_impl(self, key):

        return key in self and self[key].impl is not None
Switches between two operations depending on a scalar value (int or bool).
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/orm/instrumentation.py/ClassManager._attr_has_impl--crossover with--dataset/ETHPy150Open fchollet/keras/keras/backend/tensorflow_backend.py/switch