目前使用的是 Flask 的 session 对象。 

感觉编程起来比较复杂。

而且，在更新程序后，原来的 session 会丢失，导致点击“下一篇文章”按钮时，会报错。


  File "./EnglishPal/app/templates/userpage_get.html", line 73, in top-level template code
    <div class="alert alert-success" role="alert">According to your word list, your level is <span class="text-decoration-underline" id="user_level">{{ '%0.1f' % today_article["user_level"] }}</span>  and we have chosen an article with a difficulty level of <span class="text-decoration-underline" id="text_level">{{ today_article["text_level"] }}</span> for you.</div>
TypeError: must be real number, not str

Hui