I think the problem is that Python 3 is a different enough language that it's hard to consider it an upgrade, adapting existing code to it really is a port (alt

I think the problem is that Python 3 is a different enough language that it's hard to consider it an upgrade, adapting existing code to it really is a port (although six and __future__ help). And if you're going to port, it's not a question 2 vs 3, it's a question of 3 versus many other languages, chiefly Go.