Tornado - http web-фреймворк и асинхронная библиотека
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.
Смотри еще:
- документация
 - [fastapi]
 - [aiohttp]
 - [mongomotor]
 - [http]