<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def remove_network_from_bgp_speaker(self, speaker_id, body=None):
 """Removes a network from BGP speaker."""

        return self.put((self.bgp_speaker_path % speaker_id) +
                        "/remove_gateway_network", body=body)