from flask import Flask

from flask import request

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])

def home():

    return '<h1>Hello World!</h1><a href="http://127.0.0.1:5000/signin">登录</a>'

@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 '<h2>hello,admin</h2>'

    return '<h2>bad username or password</h2>'

if __name__ == '__main__':

    app.run()