People have got Processing working Jython (I played with it myself a very long time ago).

Jython itself is making it's way to a python 3.x implementation but it doesn't seem to be quite there for general consumption, though maybe for some creative coding things this isn't a problem, for myself I'd need to wait until it's ready.

If you are able, I'd recommend contributing to the Jython 3 work.

Check out GraalPy, part of the GraalVM project. My company has switched from Jython to GraalPy with relatively little work.

I've also worked with a python->javascript transpiler and hooked it into p5.js if your more into that

using Jython prevents you from using the regular Python ecosystem though