code: def add_comment(self, answer, content):
          
  
          from .answer import Answer
          if isinstance(answer, Answer) is False:
              raise ValueError('argument answer need to be Zhihu.Answer object.')
          if not content:
              raise ValueError('answer content cannot be empty')
          data = {
              'method': 'add_comment',
              'params': json.dumps({'answer_id': answer.aid, 'content': content}),
              '_xsrf': answer.xsrf
              }
          res = self._session.post(Answer_Add_Comment_URL,
                                   data=data)
          return res.json()['r'] == 0
docs: 给指定答案添加评论
  
          :param Answer answer: 答案对象
          :param string content: 评论内容
          :return: 成功返回 True，失败返回 False
          :rtype: bool