@property
    def is_sequence(self):
        return isinstance(self.response, (tuple, list))
Return the union of two sets as a new set.
dataset/ETHPy150Open Eforcers/gae-flask-todo/lib/werkzeug/wrappers.py/BaseResponse.is_sequence--crossover with--dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/sets.py/BaseSet.union