flask---过滤器（default length）

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原创最新推荐文章于 2026-04-25 09:12:49 发布 871 阅读 AI 写同款· GEO 优化 ›

python flask框架 jinjia2模板过滤器 from flask import Flask,render_template app =Flask(__name__) @app.route('/') def index(): context ={ 'name':'engine', 'age':18, } return render_template('index.html',**context) if __name__ == '__main__': 阅读详情

default过滤器：如果当前变量不存在，这时候可以指定默认值，

length过滤器：求列表或者字符串字典元组的长度

#encoding:utf-8
from flask import Flask,render_template

app = Flask(__name__)


@app.route('/')
def index():
    comments=[{
        'user':u'二狗',
        'content':'jierjioeriorei'
    },
        {
         'user':u'大狗',
        'content':'vjoirjoirjior'
        }
             ]
    return render_template('index.html',commnets=comments)


if __name__ == '__main__':
    app.run(debug=True)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<img src="{{ avatar|default('https://img-ph-mirror.nosdn.127.net/NN7OOz8ODXd47U867WzzuA==/3171660037675940136.png?imageView&thumbnail=223y124&quality=100&crop=0_0_223_94')}}">
<hr>
 <p>评论数({{ commnets|length}})</p>
<ul>
    {% for commnet in commnets %}
       <li>
       <a href="https://img-ph-mirror.nosdn.127.net/NN7OOz8ODXd47U867WzzuA==/3171660037675940136.png?imageView&thumbnail=223y124&quality=100&crop=0_0_223_94">{{commnet.user}}</a>
       <p>{{commnet.content}}</p>
       </li>

    {% endfor %}
    
</ul>
</body>
</html>