code: def collect_num(self):
          
          element = self.soup.find("a", {
              "data-za-a": "click_answer_collected_count"
          })
          if element is None:
              return 0
          else:
              return int(element.get_text())
docs: 获取答案收藏数
  
          :return:  答案收藏数量
          :rtype: int