code: def _on_channel_close(self, channel, reply_code_or_reason, reply_text=None):
          
          if isinstance(reply_code_or_reason, pika_errs.ChannelClosed):
              reply_code = reply_code_or_reason.reply_code
              reply_text = reply_code_or_reason.reply_text
          elif isinstance(reply_code_or_reason, int):
              reply_code = reply_code_or_reason
          else:
              reply_code = 0
              reply_text = str(reply_code_or_reason)
  
          _log.info("Channel %r closed (%d): %s", channel, reply_code, reply_text)
          self._channel = None
docs: Callback invoked when the channel is closed.
  
          Args:
              channel (pika.channel.Channel): The channel that got closed.
              reply_code_or_reason (int|Exception): The reason why the channel
                  was closed. In older versions of pika, this is the AMQP code.
              reply_text (str): The human-readable reason for the channel's
                  closure (only in older versions of pika).