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:
import asyncio
import tornado
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.write("Hello, world")
def make_app():
return tornado.web.Application([
(r"/", MainHandler),
])
async def main():
app = make_app()
app.listen(8888)
await asyncio.Event().wait()
if __name__ == "__main__":
asyncio.run(main())
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 https://www.tornadoweb.org
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