Nix sounds like a great fit as well, but my experience with it has not been that great, and I feel it is not ideal for Python. I recently gave Flox a try, which simplifies the use of Nix. I use it from time to time, but it has not yet replaced my development environment.
In your case, is maintaining 2 dev env not annoying?
In your case, is maintaining 2 dev env not annoying?