<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def show_gateway_device(self, gateway_device_id, **_params):
 """Fetch a gateway device."""

        return self.get(self.gateway_device_path % gateway_device_id,
                        params=_params)