版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/GoodLuckAC/article/details/79098881
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>