def listen_for_one_advert(self):
        events = dict(self.poller.poll(1000 * self.finder_timeout_s))
        if events not in self.socket_fd: 
            return

        message, source = self.socket.recvfrom(self.beacon_message_size)
        service_name, service_address = _unpack(message)
        self._services_found[service_name] = service_address
dataset/ETHPy150Open tjguk/networkzero/networkzero/discovery.py/_Beacon.listen_for_one_advert/swapped operands of `not in`