After struggling with the complexity of pyenv and slowness of poetry I'm really happy with rye.

It manages both python versions (which it downloads instead of compiling) and package versions. It's written in rust so it's faster and can replace pipx as well for installing global tools. (Some people will recommend uv which rye is slowly merging with buy uv is still missing some rye features, probably some time in the future you might want to switch).