tornado 0,1,13,10,0,6,0,11 travis-ci python

Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed.

2 years after Apache-2.0

Tornado Web Server

.. image:: :alt: Join the chat at :target:

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.

Hello, world

Here is a simple "Hello, world" example web app for Tornado:

.. code-block:: python

import tornado.ioloop
import tornado.web

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

def make_app():
    return tornado.web.Application([
        (r"/", MainHandler),

if __name__ == "__main__":
    app = make_app()

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

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