code: def _create_batch_message(self):
          
          return Message(body=[],
                         properties=self.properties,
                         annotations=self.annotations,
                         msg_format=self.batch_format,
                         header=self.header,
                         encoding=self._encoding)
docs: Create a ~uamqp.message.Message for a value supplied by the data
          generator. Applies all properties and annotations to the message.
  
          :rtype: ~uamqp.message.Message