Tornado is a scalable, non-blocking web server and web application framework written in Python.[2] It was developed for use by FriendFeed; the company was acquired by Facebook in 2009 and Tornado was open-sourced soon after.[3]
 | |
| Original author(s) | FriendFeed |
|---|---|
| Developer(s) | Ben Darnell, Meta, Bret Taylor |
| Initial release | 2009 |
| Stable release | 6.4.1[1]  / 6 June 2024 |
| Repository | Tornado Repository |
| Written in | Python |
| Operating system | Cross-platform |
| Available in | English |
| Type | Web server |
| License | Apache licence 2.0 |
| Website | www |
Performance
Tornado is noted for its high performance. Its design enables handling a large number of concurrent connections (i.e., tries to solve the "C10k problem").
Modules
- An asynchronous MongoDB driver called Motor.
- CouchDB drivers called corduroy and trombi.
- Asynchronous driver for PostgreSQL wrapping psycopg called Momoko
Example
The following code shows a simple web application that displays "Hello World!" when visited:[4]
import asyncioimport tornado.webclass 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())