过滤器——format格式化
flaskDemo.py
# coding: utf-8
from flask import Flask, render_template
import flask
app = Flask(__name__) # type: Flask
app.debug = True
@app.route('/')
def login():
context = {
"user": {
"name": "Warren",
"age": 18,
"gender": None,
"comment": u'<script>alert("弹出框")</script>'}
}
return render_template('index.html', **context)
if __name__ == '__main__':
app.run()
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>过滤器</title>
</head>
<body>
<p>绝对值:{{ user.age | abs }}</p>
<p>默认值:{{ user.gender or 'male'}}</p>
<p>转义:{{ user.comment }}</p>
<p>格式化:{{ "姓名:%s,年龄:%s" | format(user.name, user.age) }}</p>
</body>
</html>
我们在html
文件中通过format
引用姓名和年龄的值,传到模板里,执行代码:
修改context
的内容如下:
context = {
"user": {
"name": "Warren",
"age": 18,
"gender": None,
"comment": u'<script>alert("弹出框")</script>'},
"subject": ["math", "Chinese", "biology"]
}
index.html
文件增加:
<p>最后一个值:{{ subject | last }}</p>
<p>第一个值:{{ subject | first }}</p>
保存后刷新页面:
还有很多过滤器,下面船长把有必要知道的给大家列在下面的代码里,大家可以去试一下:
flaskDemo.py
# coding: utf-8
from flask import Flask, render_template
import flask
app = Flask(__name__) # type: Flask
app.debug = True
@app.route('/')
def login():
context = {
"user": {
"name": "Warren",
"age": 18,
"gender": None,
"comment": u'<script>alert("弹出框")</script>'},
"subject": ["math", "Chinese", "biology"],
"num": '3',
"upper": "I AM A MAN",
"lower": "i am a boy",
"repl": "A, A, A",
"title": u'life is short, I choose Python',
"space": " abc ",
"tags": u"<p>这是一个HTML标签</p>"}
return render_template('index.html', **context)
if __name__ == '__main__':
app.run()
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>过滤器</title>
</head>
<body>
<p>绝对值:{{ user.age | abs }}</p>
<p>默认值:{{ user.gender or 'male'}}</p>
<p>转义:{{ user.comment }}</p>
<p>格式化:{{ "姓名:%s,年龄:%s" | format(user.name, user.age) }}</p>
<p>最后一个值:{{ subject | last }}</p>
<p>第一个值:{{ subject | first }}</p>
<p>序列的长度:{{ subject | length }}</p>
<p>拼接:{{ subject | join(', ') }}</p>
<p>转换成整型:{{ num | int }}</p>
<p>转换成小写:{{ upper | lower }}</p>
<p>转换成小写:{{ lower | upper }}</p>
<p>相同的全部替换:{{ repl | replace('A', 'HERO') }}</p>
<p>只替换一个:{{ repl | replace('A', 'HERO', 1) }}</p>
<p>截取字符串:{{ title | truncate(9) }}</p>
<p>截断单词:{{ title | truncate(9, true) }}</p>
<p>截取前后空格:{{ space | trim }}</p>
<p>删除所有HTML标签:{{ tags | striptags }}</p>
</body>
</html>
执行代码: