---
id: tornado
version: "6.5.8"
license: Apache-2.0
license_treatment: permissive
maintenance: active
---

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

License: permissive · Maintenance: active · Popularity: top 1,000 on PyPI

## Install

pip install tornado
uv add tornado
poetry add tornado

## Description

Tornado Web Server
==================

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`Tornado <http://www.tornadoweb.org>`_ is a Python web framework and
asynchronous networking library, originally developed at `FriendFeed
<http://friendfeed.com>`_.  By using non-blocking network I/O, Tornado
can scale to tens of thousands of open connections, making it ideal for
`long polling <http://en.wikipedia.org/wiki/Push_technology#Long_Polling>`_,
`WebSockets <http://en.wikipedia.org/wiki/WebSocket>`_, 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 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()...

## AI interpretation — verify before relying

Tornado is a Python web framework and asynchronous networking library that handles high-concurrency applications through non-blocking I/O, enabling long-lived connections for WebSockets, long polling, and real-time features.

Verdict: Tornado is a mature, actively maintained web framework well-suited for high-concurrency applications. Zero known vulnerabilities, permissive licensing, and broad platform support make it a reliable choice for production async networking workloads.

[View on SkillFed](https://skillfed.io/packages/tornado) · [View on PyPI](https://pypi.org/project/tornado/)