Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.
Here is a simple "Hello, world" example web app for Tornado:
importtornado.ioloopimporttornado.webclassMainHandler(tornado.web.RequestHandler):
defget(self):
self.write("Hello, world")
defmake_app():
returntornado.web.Application([
(r"/", MainHandler),
])
if__name__=="__main__":
app=make_app()
app.listen(8888)
tornado.ioloop.IOLoop.current().start()This example does not use any of Tornado's asynchronous features; for that see this simple chat room.
Documentation and links to additional resources are available at http://www.tornadoweb.org