code: def column(self):
          
          from .column import Column
  
          if 'column' in self.soup:
              url = Column_Url + '/' + self.soup['column']['slug']
              name = self.soup['column']['name']
              return Column(url, name, session=self._session)
          else:
              return None
docs: 获取文章所在专栏.
  
          :return: 文章所在专栏
          :rtype: Column