Flask 框架
$ pip install flask写一个app.py，处理3个URL，分别是：
GET /：首页，返回Home；GET /signin：登录页，显示登录表单；POST /signin：处理登录表单，显示登录结果。
from flask import Flask
from flask import request
app = Flask(__name__)
@app.route('/', methods=['GET', 'POST'])
def home():
return 'Home
'
@app.route('/signin', methods=['GET'])
def signin_form():
return ''''''
@app.route('/signin', methods=['POST'])
def signin():
if request.form['username']=='admin' and request.form['password']=='password':
return 'Hello, admin!
'
return 'Bad username or password.
'
if __name__ == '__main__':
app.run()使用模板
Flask默认支持的模板是jinja2，所以我们先安装jinja2：
$ pip install jinja2修改app.py：
# app.py
from flask import Flask, request, render_template
app = Flask(__name__)
@app.route('/', methods=['GET', 'POST'])
def home():
return render_template('home.html')
@app.route('/signin', methods=['GET'])
def signin_form():
return render_template('form.html')
@app.route('/signin', methods=['POST'])
def signin():
username = request.form['username']
password = request.form['password']
if username=='admin' and password=='password':
return render_template('signin-ok.html', username=username)
return render_template('form.html', message='Bad username or password', username=username)
if __name__ == '__main__':
app.run()增加模板文件：
# templates/form.html
Please Sign In
{% if message %}
{{ message }}
{% endif %}
# templates/signin-ok.html
Welcome, {{ username }}
Welcome, {{ username }}!
运行：
$ python app.py
* Running on http://127.0.0.1:5000/除了Flask，常见的Python Web框架还有：