tornado-options.py

import tornado.ioloop
import tornado.web

# http://www.tornadoweb.org/en/stable/options.html
from tornado.options import parse_command_line

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")

application = tornado.web.Application([
    (r"/", MainHandler),
])

if __name__ == "__main__":
    parse_command_line()

    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()