Overview

Tornado 6.1, released on October 30, 2021, adds official Python 3.9 support and improves asyncio ecosystem compatibility.

Main Features

Python 3.9 support

Tornado 6.1 is fully compatible with Python 3.9, including new type syntax and integration with asyncio improvements.

python 
import tornado.ioloop
import tornado.web

class MainHandler(tornado.web.RequestHandler):
    async def get(self):
        self.write({'message': 'Tornado 6.1 with Python 3.9'})

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

# app = make_app()
# app.listen(8888)
# tornado.ioloop.IOLoop.current().start()

Asyncio compatibility

Asyncio integration is strengthened: the Tornado event loop now uses asyncio by default, making it easier to mix with other async libraries.

python 
import asyncio
import tornado.web
from tornado.httpclient import AsyncHTTPClient

async def fetch_data():
    """Using Tornado's async HTTP client."""
    client = AsyncHTTPClient()
    response = await client.fetch('https://httpbin.org/get')
    return response.body.decode()

# Compatible with asyncio.run()
# result = asyncio.run(fetch_data())
# print(result)

Sources