Problem :
I know that ArchLinux has Python 3 as the default Python install. What other Linux distributions ship with Python 3 as the default Python version?
I’ve checked this SO question, but it seems more geared towards answering “what distributions have Python 3 packages available?”
Solution :
Arch and Gentoo have python 3 as system default, that is when you pacman -S python or emerge dev-lang/python you will get python 3.* and that will be the target for /usr/bin/python