def nack(self, unless_reply_sent=False):
        if unless_reply_sent or self._sent_reply:
            return
        self.server.send_reply(self.request, None, msg_type=Message.NACK, headers=self._headers)
        self._sent_reply = True
dataset/ETHPy150Open deliveryhero/lymph/lymph/core/channels.py/ReplyChannel.nack/operator `and` -> `or`