code: def new_message(self, body=''):
          
          m = self.message_class(self, body)
          m.queue = self
          return m
docs: Create new message of appropriate class.
  
          :type body: message body
          :param body: The body of the newly created message (optional).
  
          :rtype: :class:`boto.sqs.message.Message`
          :return: A new Message object