Learn Go ;-)

No seriously, spend an evening on doing the tour [1] and you won't regret it (all you need is a browser). Actually, the syntax is kinda clean and easy to read. Python might look cleaner at first glance, but it has a lot more tricks you need to learn to understand someone else's code.

Writing Go on the other side is more complicated as you have to learn how to design interfaces properly and there are a lot of common mistakes everybody does in the beginning.

[1]: https://tour.golang.org

Check out Wagtail, Mezzanine, and Pico.

Great suggestions. Thanks for the recommendations. This feed is starting to lay out some really useful context for the next generation of p2p publishing. Btw, here are links to the recommendations: https://wagtail.io http://mezzanine.jupo.org http://picocms.org

I'm looking specifically for ActivityPub examples.

I was looking through the other ActivityPub examples OP mentioned and funkwhale seems to be written in Python (https://code.eliotberriot.com/funkwhale/funkwhale)

Edit: I recommend going through https://github.com/topics/activitypub, have quite a few written in Python.