#!/usr/bin/env python# _*_coding:utf-8 _*_import tornado.ioloopimport tornado.webapplication = tornado.web.Application([])def decorator(view):    URL = view.URL    application.add_handlers('.*$', [(r'%s' % (URL), view)])@decoratorclass UserstHandler(tornado.web.RequestHandler):    URL = '/users'    def get(self, *args, **kwargs):        self.write("UserstHandler")@decoratorclass IndexHandler(tornado.web.RequestHandler):    URL = '/'    def get(self, *args, **kwargs):        self.write("IndexHandler")if __name__ == "__main__":    application.listen(8000)    print("http://127.0.0.1:8000")    tornado.ioloop.IOLoop.instance().start()