404 web.py

import web
import app.controllers
from config import view

def notfound():
    return web.notfound(view.error())

urls = (
    '/post/(\+?[1-9][0-9]*)', 'app.controllers.post.post_show', #正则匹配url 验证非零的正整数
) 

app = web.application(urls, globals())

if __name__ == "__main__":
    app.notfound = notfound
    app.run()