Tornado is an open source version of the scalable, non-blocking web server and tools that power FriendFeed. The FriendFeed application is written using a web framework that looks a bit like web.py or Google's webapp, but with additional tools and optimizations to take advantage of the underlying non-blocking infrastructure.

The framework is distinct from most mainstream web server frameworks (and certainly most Python frameworks) because it is non-blocking and reasonably fast. Because it is non-blocking and uses epoll, it can handle thousands of simultaneous standing connections, which means it is ideal for real-time web services. We built the web server specifically to handle FriendFeed's real-time features — every active user of FriendFeed maintains an open connection to the FriendFeed servers. (For more information on scaling servers to support thousands of clients, see The C10K problem.)

See the Tornado documentation for a detailed walkthrough of the framework.

Download and install
Download: tornado-0.1.tar.gz

tar xvzf tornado-0.1.tar.gz
cd tornado-0.1
python setup.py build
sudo python setup.py installThe Tornado source code is hosted on GitHub.

Prerequisites
Tornado has been tested on Python 2.5 and 2.6. To use all of the features of Tornado, you need to have PycURL and a JSON library like simplejson installed. Complete installation instructions for Mac OS X and Ubuntu are included below for convenience.

Mac OS X 10.5/10.6

sudo easy_install setuptools pycurl==7.16.2.1 simplejsonUbuntu Linux

sudo apt-get install python-dev python-pycurl python-simplejsonHello, world
Here is the canonical "Hello, world" example app for Tornado:

import tornado.httpserver
import tornado.ioloop
import tornado.web

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

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

if __name__ == "__main__":
http_server = tornado.httpserver.HTTPServer(application)
http_server.listen(8888)
tornado.ioloop.IOLoop.instance().start()See the Tornado documentation for a detailed walkthrough of the framework.

Discussion and support
You can discuss Tornado and report bugs on the Tornado developer mailing list.

Tornado is one of Facebook's open source technologies. It is available under the Apache Licence, Version 2.0.
This web site and all documentation is licensed under Creative Commons 3.0.


——好像没有win下的？而且，离一个真正的应用太远了：还有很多辅助的东西需要积累。。。。。。