Flask

#environ：一个包含所有HTTP请求信息的dict对象
#start_response：一个发送HTTP响应的函数
def application(environ, start_response):
method = environ['REQUEST_METHOD']
path = environ['PATH_INFO']

#if method=='GET' and path=='/':
#    return handle_home(environ, start_response)

start_response('200 OK', [('Content-Type', 'text/html')])
#[1:] 切片 第2个字符到后面所有字符
body = '<h1>Hello, %s!</h1>' % (environ['PATH_INFO'][1:] or 'web')
return [body.encode('utf-8')]
#return [b'<h1>Hello, web!</h1>']

# 从wsgiref模块导入:
from wsgiref.simple_server import make_server

# 创建一个服务器，IP地址为空，端口是8000，处理函数是application:
httpd = make_server('', 8000, application)
print('Serving HTTP on port 8000...')
# 开始监听HTTP请求:
httpd.serve_forever()

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():
# 需要从request对象读取表单内容：
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()

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()