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It's not just that, it's also a filesystem layout issue. If you install everything in `/usr` or `<venv>/lib/pythonX.Y/site-packages` you cannot have two version
by stabbles 8mo ago
It's not just that, it's also a filesystem layout issue. If you install everything in `/usr` or `<venv>/lib/pythonX.Y/site-packages` you cannot have two versions / variants of the same package installed concurrently.
For that you need one prefix per installation, which is what Nix, Guix, and Spack do.
- avsm 8mo agoThe runtime can also use mount namespaces to support concurrent installations. Or, if there is a compilation step, the linker can not expose symbols for clashing libraries and just resolve them within the dependency chain. The package calculus allows all of these to specified cleanly in a single form.