python flask 例子

python flask 例子

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概述

Flask是一个使用 Python 编写的轻量级 Web 应用框架。其 WSGI 工具箱采用 Werkzeug ，模板引擎则使用 Jinja2 。Flask使用 BSD 授权。

Flask也被称为 “microframework” ，因为它使用简单的核心，用 extension 增加其他功能。Flask没有默认使用的数据库、窗体验证工具。

http://docs.jinkan.org/docs/jinja2/

http://flask-script.readthedocs.io/en/latest/

http://jinja.pocoo.org/docs/dev/templates/

代码 python 2

pip install flask

# -*- encoding=UTF-8 -*-

from flask import Flask, render_template, request, make_response, redirect, flash, get_flashed_messages
import logging
from logging.handlers import RotatingFileHandler

app = Flask(__name__)
app.jinja_env.line_statement_prefix = '#'
app.secret_key = 'nowcoder'


@app.route('/index/')
@app.route('/')
def index():
    res = ''
    for msg, category in get_flashed_messages(with_categories=True):
        res = res + category + msg + '<br>'
    res += 'hello'
    return res


@app.route('/profile/<int:uid>/', methods=['GET', 'post'])
def profile(uid):
    colors = ('red', 'green')
    infos = {'nowcoder': 'abc', 'google': 'def'}
    return render_template('profile.html', uid=uid, colors=colors, infos=infos)


@app.route('/request')
def request_demo():
    key = request.args.get('key', 'defaultkey')
    res = request.args.get('key', 'defaultkey') + '<br>'
    res = res + request.url + '++' + request.path + '<br>'
    for property in dir(request):
        res = res + str(property) + '<br>' + str(eval('request.' + property)) + '<br>'
    response = make_response(res)
    response.set_cookie('nowcoderid', key)
    response.status = '404'
    response.headers['nowcoder'] = 'hello~~'
    return response


@app.route('/newpath')
def newpath():
    return 'newpath'


@app.route('/re/<int:code>')
def redirect_demo(code):
    return redirect('/newpath', code=code)


@app.errorhandler(400)
def exception_page(e):
    response = make_response('出错啦~')
    return response


@app.errorhandler(404)
def page_not_found(error):
    return render_template('not_found.html', url=request.url), 404


@app.route('/admin')
def admin():
    if request.args['key'] == 'admin':
        return 'hello admin'
    else:
        raise Exception()

@app.route('/login')
def login():
    app.logger.info('log success')
    flash('登陆成功', 'info')
    return 'ok'
    # return redirect('/')


@app.route('/log/<level>/<msg>/')
def log(level, msg):
    dict = {'warn': logging.WARN, 'error': logging.ERROR, 'info': logging.INFO}
    if dict.has_key(level):
        app.logger.log(dict[level], msg)
    return 'logged:' + msg


def set_logger():
    info_file_handler = RotatingFileHandler('D:\\logs\\info.txt')
    info_file_handler.setLevel(logging.INFO)
    app.logger.addHandler(info_file_handler)

    warn_file_handler = RotatingFileHandler('D:\\logs\\warn.txt')
    warn_file_handler.setLevel(logging.WARN)
    app.logger.addHandler(warn_file_handler)

    error_file_handler = RotatingFileHandler('D:\\logs\\error.txt')
    error_file_handler.setLevel(logging.ERROR)
    app.logger.addHandler(error_file_handler)


if __name__ == '__main__':
    set_logger()
    app.run(debug=True)

flask_script

# -*- encoding=UTF-8 -*-
from flask_script import Manager
from c2 import app

manager = Manager(app)

@manager.option('-n',  '--name', dest='name', default='nowcoder')
def hello(name):
    print 'hello', name

@manager.command
def initialize_database():
    'initialize database'
    print 'database ...'

if __name__ == '__main__':
    manager.run()