code: def posts(self):
          
          origin_host = self._session.headers.get('Host')
          for offset in range(0, (self.post_num - 1) // 10 + 1):
              self._session.headers.update(Host='zhuanlan.zhihu.com')
              res = self._session.get(
                  Column_Posts_Data.format(self._in_name, offset * 10))
              soup = res.json()
              self._session.headers.update(Host=origin_host)
              for post in soup:
                  yield self._parse_post_data(post)
docs: 获取专栏的所有文章.
  
          :return: 专栏所有文章，返回生成器
          :rtype: Post.Iterable