code: def follow(self, something, follow=True):
          
          from .question import Question
          from .topic import Topic
          from .collection import Collection
          if isinstance(something, Author):
              if something.url == self.url:
                  return False
              data = {
                  '_xsrf': something.xsrf,
                  'method': '	follow_member' if follow else 'unfollow_member',
                  'params': json.dumps({'hash_id': something.hash_id})
              }
              res = self._session.post(Follow_Author_Url, data=data)
              return res.json()['r'] == 0
          elif isinstance(something, Question):
              data = {
                  '_xsrf': something.xsrf,
                  'method': 'follow_question' if follow else 'unfollow_question',
                  'params': json.dumps({'question_id': str(something.qid)})
              }
              res = self._session.post(Follow_Question_Url, data=data)
              return res.json()['r'] == 0
          elif isinstance(something, Topic):
              data = {
                  '_xsrf': something.xsrf,
                  'method': 'follow_topic' if follow else 'unfollow_topic',
                  'params': json.dumps({'topic_id': something.tid})
              }
              res = self._session.post(Follow_Topic_Url, data=data)
              return res.json()['r'] == 0
          elif isinstance(something, Collection):
              data = {
                  '_xsrf': something.xsrf,
                  'favlist_id': something.cid
              }
              res = self._session.post(
                  Follow_Collection_Url if follow else Unfollow_Collection_Url,
                  data=data)
              return res.json()['r'] == 0
          else:
              raise ValueError('argument something need to be '
                               'zhihu.Author, zhihu.Question'
                               ', Zhihu.Topic or Zhihu.Collection object.')
docs: 关注用户、问题、话题或收藏夹
  
          :param Author/Question/Topic something: 需要关注的对象
          :param bool follow: True-->关注，False-->取消关注
          :return: 成功返回True，失败返回False
          :rtype: bool