Not system Python (not least because that's a hassle to do these days anyway, with all the safeguards OS vendors have put in), but _my_ version of globally. My (user) global PyEnv version, for example.
Now having said that, I suspect PyEnv is doing some voodoo behind the scenes, because I occasionally see messages like "Package X what's version N, but you have version N1". I've never investigated them though, since both old and new packages seem to work just fine regardless.
I see. I think your Python usage is very limited. Becaue even when I was using Pyenv, I still needed pyenv-virtualenv to make sure my repositories didn't cross install different chain of dependencies into the same version.