But the language isn't designed to support multiple versions of the same library in the same runtime environment. If you get them both to load (and there are a lot of ways), they are different libraries (actual different module objects) with different names (or the same name in different namespaces). Packaging tools can't do anything meaningful about this. I write about this on HN more often than I'd like; see e.g. https://news.ycombinator.com/item?id=45467514 . It's also covered in https://zahlman.github.io/posts/2024/12/24/python-packaging-... .