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()