python-tornado-hello,world

#!/usr/bin/python

import tornado.httpserver
import tornado.ioloop
import tornado.options
import tornado.web

from tornado.options import define,options

define('port',default=8000,help="run on the given port",type=int)

class IndexHandler(tornado.web.RequestHandler):
    def get(self):
        greeting=self.get_argument("greeting","Hello Tornado")
        self.write(greeting+"nihao a ")

if __name__=="__main__":
    tornado.options.parse_command_line()
    app=tornado.web.Application(handlers=[(r"/",IndexHandler)])
    http_server=tornado.httpserver.HTTPServer(app)
    http_server.listen(options.port)
    tornado.ioloop.IOLoop.instance().start()