code: def add_comment(self, topic_id, content, reply_id=None):
          
          return self.api.req(API_GROUP_ADD_COMMENT % topic_id, 'post', data={
              'ck': self.api.ck(),
              'ref_cid': reply_id,
              'rv_comment': content,
              'start': 0,
              'submit_btn': '加上去',
          })
docs: 添加评论
          
          :param topic_id: 话题ID
          :param content: 内容
          :param reply_id: 回复ID
          :return: None