Decorator routing configuration

 

The above "Hello World" to read as follows:

# tornadoapp.py
import tornado.ioloop
import tornado.web

class Application(tornado.web.Application): def route(self, pattern): def _(handler): handler_pattern = [(pattern, handler)] self.add_handlers(".*$", handler_pattern) return handler return _ app = Application() @app.route(r"/") class MainHandler(tornado.web.RequestHandler): def get(self): self.write("Hello, world") if __name__ == "__main__": app.listen(8888) tornado.ioloop.IOLoop.instance().start()