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> Campus Bubble is a single page app with React.js on a frontend and Python services on a backend. We use Flask, SQLAlchemy, Tornado (SockJS push notifications), PostgreSQL, Redis - a pretty standard Flask stack.

Can anyone explain how Flask and Tornado could be used together?

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They're being used side by side and running in separate processes.

For Campus Bubble, tornado app is a relatively simple push broker. Whenever something happens, Flask app pushes notification to a broker and broker pushes them in fan-out fashion to subscribers.

I even wrote another blog post a while ago about possible approach: http://mrjoes.github.io/2013/06/21/python-realtime.html

Can't speak much on Flask, but I've seen Tornado used similarly with Django.

Wonderful article. Btw, you might find the Pushpin project interesting. It runs as a proxy so you don't need to split your app in two.

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