code: def reply_topic(self, topic_id, content):
          
          data = {
              'body': content,
              'csrfmiddlewaretoken': self._request.cookies.get('csrftoken')
          }
          url = 'http://www.shanbay.com/api/v1/forum/thread/%s/post/' % topic_id
          r = self.request(url, 'post', data=data)
          j = r.json()
          if j['status_code'] == 0:
              return j['data']['thread']['id']
docs: 小组回帖
  
          :return: 帖子 id 或 ``None``