def refresh(self):
        """刷新 Answer object 的属性. 
        例如赞同数增加了, 先调用 ``refresh()`` 
        再访问 upvote_num属性, 可获得更新后的赞同数.
        
        :return: None
        """
        super().refresh()
        self._html = None
        self._upvote_num = None
        self._content = None
        self._collect_num = None
        self._comment_num = None
def refresh ( self ) : super ( ) . refresh ( ) self . _html = None self . _upvote_num = None self . _content = None self . _collect_num = None self . _comment_num = None
刷新 Answer object 的属性. 
        例如赞同数增加了, 先调用 ``refresh()`` 
        再访问 upvote_num属性, 可获得更新后的赞同数.
        
        :return: None