python flask 例子

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_messagesimport loggingfrom logging.handlers import RotatingFileHandlerapp = 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 + '
'    res += 'hello'    return res@app.route('/profile/
    
     /', 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') + '
     
'    res = res + request.url + '++' + request.path + '
     
'    for property in dir(request):        res = res + str(property) + '
     
' + str(eval('request.' + property)) + '
     
'    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/
     
      ')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/
      
       /
       
        /')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:' + msgdef 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 Managerfrom c2 import appmanager = Manager(app)@manager.option('-n',  '--name', dest='name', default='nowcoder')def hello(name):    print 'hello', name@manager.commanddef initialize_database():    'initialize database'    print 'database ...'if __name__ == '__main__':    manager.run()

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概述

代码 python 2