路由：
@app.route('/')
def index():
return '<h1>hello</h1>'

<int:id>

@app.route('/user/<name>')
def user(name):
return '<h1>hello</h1>'

-------------------------完整的程序-------------------------------
from flask import Flask
app = Flask(name)
@app.route('/')
def index():
return '<h1>Hello World!</h1>'
if name == 'main':
app.run(debug=True)

request.headers.get('User-Agent')
获取request对象
from flask import request
@app.route('/')
def index():
user_agent = request.headers.get('User-Agent')
return '<p>Your browser is %s</p>' % user_agent
//
from flask import session
from flask import current_app

钩子：
before_first_request
before_request
after_request
teardown_request

返回400状态码

@app.route('/')
def index():
return '<h1>Bad Request</h1>', 400

返回response

from flask import make_response
@app.route('/')
def index():
response = make_response('<h1>This document carries a cookie!</h1>')
response.set_cookie('answer', '42')
return response

make_response

response

重定向

from flask import redirect
@app.route('/')
def index():
return redirect('http://www.baidu.com')

返回404

from flask import abort
@app.route('/user/<id>')
def get_user(id):
user = load_user(id)
if not user:
abort(404)
return '<h1>Hello, %s</h1>' % user.name

用flask-script 启动

from flask.ext.script import Manager
manager = Manager(app)

...

if name == 'main':
manager.run()
启动：python hello.py runserver --host 0.0.0.0
参数：-t host,-p port,--threaded,--processes xx,-d --no-debug

自定义错误页面
@app.errorhandler(404)
def page_not_found(e):
return render_template('404.html'),404
@app.errorhandler(500)
def internal_server_error(e):
return render_template('500.html'), 500

动态链接：

url_for('user', name='john', _external=True)
url_for('index', page=2)
url_for('static', filename='css/styles.css', _external=True)

base.html 定义收藏夹图标

{% block head %}
{{ super() }}
<link rel="shortcut icon" href="{{ url_for('static', filename = 'favicon.ico') }}"
type="image/x-icon">
<link rel="icon" href="{{ url_for('static', filename = 'favicon.ico') }}"
type="image/x-icon">
{% endblock %}