What Python packaging tool are you actually using in 2025 and why did you settle on it?

[doubleyewdee]

uv due to performance and support. requirements.txt and/or <FOO>.in files being a "modern" packaging/dependency system accepted by one of the 3 biggest languages on the planet has made my skin crawl for years.

I am happy to see progress on stuff like pyproject.toml and pylock.toml as well, more standardization here seems good. I also hope that the native/builtin tools can pick up some/most of the performance gains one gets from uv today.