Sorry but we actually cheated on that part. Redid the page so that the function that is now in Go is a separate little service that is called via ajax directly by the users' browsers.
So there's no actual Python-Go interaction in our code.
This was quicker, cleaner and has made the page more responsive for users.
Thanks this comment is useful, client side integration is integration after all, and I think if it was simple, you would have it done differently (if I understand your words correctly - "cheating").
