web.py 十分钟创建简易博客

 

一、web.py简介

web.py是一款轻量级的python web开发框架，简单、高效、学习成本低，特别适合作为python web开发的入门框架。官方站点：http://webpy.org/

二、web.py安装

1、下载：http://webpy.org/static/web.py-0.33.tar.gz

2、解压并进入web.py-0.33目录，安装：python setup.py install

三、创建简易博客

1、目录说明：主目录blog/，模板目录blog/templates

2、在数据库“test”中创建表“entries”

CREATE TABLE entries ( id INT AUTO_INCREMENT, title TEXT, content TEXT, posted_on DATETIME, primary key (id) );  

3、在主目录创建blog.py，blog/blog.py

#载入框架 import web #载入数据库操作model（稍后创建） import model #URL映射 urls = ( '/', 'Index', '/view/(/d+)', 'View', '/new', 'New', '/delete/(/d+)', 'Delete', '/edit/(/d+)', 'Edit', '/login', 'Login', '/logout', 'Logout', ) app = web.application(urls, globals()) #模板公共变量 t_globals = { 'datestr': web.datestr, 'cookie': web.cookies, } #指定模板目录，并设定公共模板 render = web.template.render('templates', base='base', globals=t_globals) #创建登录表单 login = web.form.Form( web.form.Textbox('username'), web.form.Password('password'), web.form.Button('login') ) #首页类 class Index: def GET(self): login_form = login() posts = model.get_posts() return render.index(posts, login_form) def POST(self): login_form = login() if login_form.validates(): if login_form.d.username == 'admin' / and login_form.d.password == 'admin': web.setcookie('username', login_form.d.username) raise web.seeother('/') #查看文章类 class View: def GET(self, id): post = model.get_post(int(id)) return render.view(post) #新建文章类 class New: form = web.form.Form( web.form.Textbox('title', web.form.notnull, size=30, description='Post title: '), web.form.Textarea('content', web.form.notnull, rows=30, cols=80, description='Post content: '), web.form.Button('Post entry'), ) def GET(self): form = self.form() return render.new(form) def POST(self): form = self.form() if not form.validates(): return render.new(form) model.new_post(form.d.title, form.d.content) raise web.seeother('/') #删除文章类 class Delete: def POST(self, id): model.del_post(int(id)) raise web.seeother('/') #编辑文章类 class Edit: def GET(self, id): post = model.get_post(int(id)) form = New.form() form.fill(post) return render.edit(post, form) def POST(self, id): form = New.form() post = model.get_post(int(id)) if not form.validates(): return render.edit(post, form) model.update_post(int(id), form.d.title, form.d.content) raise web.seeother('/') #退出登录 class Logout: def GET(self): web.setcookie('username', '', expires=-1) raise web.seeother('/') #定义404错误显示内容 def notfound(): return web.notfound("Sorry, the page you were looking for was not found.") app.notfound = notfound #运行 if __name__ == '__main__': app.run() 

4、在主目录创建model.py，blog/model.py

import web import datetime #数据库连接 db = web.database(dbn = 'mysql', db = 'test', user = 'root', pw = '123456') #获取所有文章 def get_posts(): return db.select('entries', order = 'id DESC') #获取文章内容 def get_post(id): try: return db.select('entries', where = 'id=$id', vars = locals())[0] except IndexError: return None #新建文章 def new_post(title, text): db.insert('entries', title = title, content = text, posted_on = datetime.datetime.utcnow()) #删除文章 def del_post(id): db.delete('entries', where = 'id = $id', vars = locals()) #修改文章 def update_post(id, title, text): db.update('entries', where = 'id = $id', vars = locals(), title = title, content = text) 

5、在模板目录依次创建：base.html、edit.html、index.html、new.html、view.html

$def with (page)

• Home
$if cookie().get('username'):
• New Post

$:page $def with (post, form)

Edit $form.d.title

$:form.render()

Delete post

$def with (posts, login_form)

Blog posts

$if not cookie().get('username'):

$:login_form.render()

$else: Welcome $cookie().get('username')!Logout

$for post in posts:
• $post.title on $post.posted_on $if cookie().get('username'): Edit Del

$def with (form)

New Blog Post

$:form.render()

$def with (post)

$post.title

$post.posted_on
$post.content 

6、进入主目录在命令行下运行：python blog.py，将启动web服务，在浏览器输入：http://localhost:8080/，简易博客即已完成。