python tornado如何改代码？

import tornado.ioloop
import tornado.web
 
class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")
settings = {
'template_path':'template',
'static_path':'static',
}
def make_app():
    return tornado.web.Application([
        (r"/", MainHandler),
    ],**settings)
 
if __name__ == "__main__":
    app = make_app()
    app.listen(8888)
tornado.ioloop.IOLoop.current().start()