If you're code is still locked to 2.7, what your OS ships with doesn't matter.

Major Linux distros already do.

Name one other than Arch.

Fedora has for a while. I really don't recall regarding versions prior to Ubuntu 13.10, but this version has Py3x as a default.

Ubuntu 13.10 ships with python3, but python2 is still the default python you get when you run /usr/bin/python

I think most distributions don't intend to change /usr/bin/python to 3 in the observeble future as that will break scripts. The meaningful way in which distros work on 2->3 transition is uprading apps installed by default to use 3 so python2 can be thrown out of the default CD image.

Sources: http://radiofreepython.com/episodes/10/ (IIRC this is where I learn this but I'm lazy to listen again to confirm. I recall Barry mentioned some distro that did change /usr/bin/python to 3 and that a lot of stuff broke.) https://wiki.ubuntu.com/Python/3 https://mail.python.org/pipermail/python-dev/2013-July/12752...

My apologies, re 13.10. I forgot about that line in my .bash_aliases file!

I stand by Fedora though with a reasonable degree of confidence!

No, Fedora ships with 2.7.

Well, I maintain: when I'm wrong, I'm wrong! :-)

Doesn't look like they did it yet: http://fedoraproject.org/wiki/Changes/Python_3_as_Default

Well, when I'm wrong, I'm wrong!