Same, nix seems like such a perfect solution- but it's prohibitively hard. Sure, I could use it and sink 12 hours into reading the documentation, or I could just install pyenv/nvm/etc and be done in 1 minute.

Look at Python with Nix: https://nixos.wiki/wiki/Python And then consider the simplicity of `pyenv install x.x.x` and a requirements.txt.