@AndrasDeak Of course apt and pip would use different trees. apt handles system installation. pip is for locally installed packages.
@AndrasDeak I don't see the relevance of virtualenv here. That's for ones personal work, right?
@AndrasDeak I can't remember what flags I've used with pip/pip3 in the past. I think I might have used --user. A search of history just shows pip install.
Adding your user to a group might increase your privileges, or it might not. If that group is not already in use, it's irrelevant. So it's orthogonal to something like sudo.
@Kevin closest I can think of is the (absolutely brilliant and worth reading even as an adult) Chrestomanci series by Diana Wynne Jones. — terdon7 hours ago