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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def sg_query_streamer(self, index):
 """Query the current status of a streamer."""


        resp = self.sensor_graph.query_streamer(index)
        if resp is None:
            return [struct.pack("<L", _pack_sgerror(SensorGraphError.STREAMER_NOT_ALLOCATED))]

        return [struct.pack("<LLLLBBBx", *resp)]