No1：
hello.py
def application(environ,start_response): start_response('200 OK',[('Content-Type','text/html')]) return [b'<h1>Hello,web!<h1>']
server.py
from wsgiref.simple_server import make_server from hello import application httpd = make_server('',8000,application) print('Serving HTTP on port 8000..') httpd.serve_forever()
执行server.py后打开浏览器
无论多么复杂的Web应用程序，入口都是一个WSGI处理函数。HTTP请求的所有输入信息都可以通过environ获得，HTTP响应的输出都可以通过start_response()加上函数返回值作为Body。
No2：
【Flask】web框架
另外
from flask import Flask from flask import request app=Flask(__name__) @app.route('/',methods=['GET','POST']) def home(): return '<h1>Home</h1>' @app.route('/signin',methods=['GET']) def signin_form(): return '''<form action="/signin" method="post"> <p><input name="username"></p> <p><input name="password" type="password"></p> <p><button type="submit">Sign In</button></p> </form>''' @app.route('/signin',methods=['POST']) def signin(): if request.form['username']=='admin' and request.form['password']=='password': return '<h3>Hello,admin!</h3>' return '<h3>Bad username or password.</h3>' if __name__== '__main__': app.run()
注意：py文件命名的时候不要和框架重名
运行结果
No3：
【MVC】
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 usesrname or password',username=username) if __name__ == '__main__': app.run()
<html> <head> <title>Home</title> </head> <body> <h1 style="font-style:italic">Home</h1> </body> </html>
<html> <head> <title>Please Sign In</title> </head> <body> {% if message %} <p style="color:red">{{message}}</p> {% endif %} <form action="/signin" method="post"> <legend>Please sign in:</legend> <p><input name="username" placeholder="Username" value="{{username}}"></p> <p><input name="password" placeholder="Password" type="password"></p> <p><button type="submit">Sign In</button></p> </from> </body> </html>
<html> <head> <title>Welcome,{{username}}</title> </head> <body> <p>Welcome,{{username}}!</p> </body> </html>
运行结果
有了MVC，我们就分离了Python代码和HTML代码