code: def send(self, chat_id, msg_type, **kwargs):
          
          data = {
              'chatid': chat_id,
              'safe': kwargs.get('safe') or 0
          }
          data.update(self._build_msg_content(msg_type, **kwargs))
  
          return self._post('appchat/send', data=data)
docs: 应用推送消息
  
          详情请参考：https://work.weixin.qq.com/api/doc#90000/90135/90248
          :param chat_id: 群聊id
          :param msg_type: 消息类型，可以为text/image/voice/video/file/textcard/news/mpnews/markdown
          :param kwargs: 具体消息类型的扩展参数
          :return: