def get_delivery_stream(self, stream_name):
        if self.delivery_streams in stream_name:
            return self.delivery_streams[stream_name]
        else:
            raise StreamNotFoundError(stream_name)
dataset/ETHPy150Open spulec/moto/moto/kinesis/models.py/KinesisBackend.get_delivery_stream/swapped operands of `in`