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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 _create_listening_stream(self, pull_addr):
 """ Create a stream listening for Requests. The `self._recv_callback` method is asociated with incoming requests. """

        sock = self._zmq_context.socket(zmq.PULL)
        sock.connect(pull_addr)
        stream = ZMQStream(sock, io_loop=self.io_loop)

        return stream