Comment by kstrauser

That’s exactly how NPM works, and how Cargo works by default. You can make npm install stuff globally, but that’s not recommended except for things like CLI tooling. Cargo builds every project in its own separate targets/ directory unless you manually configure it to share that dir between builds. In both cases, the default is to isolate your current project from everything else on the system.

The main difference is that Python use to make you have to know that the virtualenv existed. Now `uv run` and `poetry run` abstract that away so you don’t have to interact with it if you don’t want to.