Flask App不会加载app.py（提供的文件/路径（app）似乎不存在） [英] Flask App will not load app.py (The file/path provided (app) does not appear to exist)

问题描述

我的烧瓶应用程序正在为（）块的输出'no content'，我不知道为什么。

My flask app is outputting 'no content' for the for() block and i dont know why.

我在 app.py 中测试了我的查询，这里是 app.py ：

I tested my query in app.py , here is app.py:

# mysql config
app.config['MYSQL_DATABASE_USER'] = 'user'
app.config['MYSQL_DATABASE_PASSWORD'] = 'mypass'
app.config['MYSQL_DATABASE_DB'] = 'mydbname'
app.config['MYSQL_DATABASE_HOST'] = 'xxx.xxx.xxx.xxx'
mysql = MySQL()
mysql.init_app(app)
c = mysql.connect().cursor()
blogposts = c.execute("SELECT post_title, post_name FROM mydbname.wp_posts WHERE post_status='publish' ORDER BY RAND() LIMIT 3")

@app.route('/', methods=('GET', 'POST'))
def email():
    form = EmailForm()

    if request.method == 'POST':
        if form.validate() == False:
            return 'Please fill in all fields <p><a href="/">Try Again</a></p>'
        else:
            msg = Message("Message from your visitor",
                          sender='[e-mail]',
                          recipients=['[e-mail]'])
            msg.body = """
            From: %s
            """ % (form.email.data)
            mail.send(msg)
            #return "Successfully  sent message!"
            return render_template('email_submit_thankyou.html')
    elif request.method == 'GET':
        return render_template('index.html', blogposts)

这就是我的 app.py 的样子。

以下是 templates / 中的 index.html ：

    <ul>
        {% for blogpost in blogposts %}
        <li><a href="{{blogpost[1]}}">{{blogpost[0]}}</a></li>
        {% else %}
        <li>no content...</li>
        {% endfor %}
        <div class="clearL"> </div>
    </ul>

我检查了这个查询，并返回所需的输出：

I checked the query, and it returns desired output like:

ID   post_title       post_name
1    a title here     a-title-here
2    a title here2     a-title-here2
3    a title here3     a-title-here3

如果我尝试通过运行<$ c $重启dev服务器c> export FLASK APP = app.py'，然后是 flask run`，我得到一个错误：

If i try to restart the dev server by running export FLASK APP=app.py', thenflask run`, i get an error of:

Error: The file/path provided (app) does not appear to exist.  Please verify the path is correct.  If app is not on PYTHONPATH, ensure the extension is .py

我也尝试通过 export FLASK_APP = app.py 然后 python -m flask run - 这也给出同样的错误。

I've also tried running via export FLASK_APP=app.py then python -m flask run - this also gives the same error.

想法如何解决？

推荐答案

您的模板中没有任何内容称为 blogposts 。您需要使用关键字参数传递数据：

You haven't got anything in your template called blogposts. You need to use keyword arguments to pass the data:

return render_template('index.html', blogposts=blogposts)

另请注意，您应该在函数内部真正执行该查询，否则只会执行进程启动，总是有同样的三个职位。

Also note you should really do that query inside the function, otherwise it will only ever execute on process start and you'll always have the same three posts.

这篇关于Flask App不会加载app.py（提供的文件/路径（app）似乎不存在）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！