code: def _publish_confirm(self, frames_out):
          
          confirm_uuid = self._channel.rpc.register_request(['Basic.Ack',
                                                             'Basic.Nack'])
          self._channel.write_frames(frames_out)
          result = self._channel.rpc.get_request(confirm_uuid, raw=True)
          self._channel.check_for_errors()
          if isinstance(result, specification.Basic.Ack):
              return True
          return False
docs: Confirm that message was published successfully.
  
          :param list frames_out:
  
          :rtype: bool