Once the Bullseye branches are merged, it would be nice to a clean up of the usage of old Python syntax from our numerous repos. There are some newer things in 3.9 that would be nice, but we still have things dating back to Python 2 like old formats, class definitions and imports.

We can do the simple stuff automatically with tools like pyupgrade. It would be nice to eventually include it in pre-commit, but for now just running it in as many repos as possible would be a vast improvement.