Well, there are some new nifty things, e.g. not having to write u in front of every string or a more pleasant subprocess API or the fact that dicts in 3.6 keep

Well, there are some new nifty things, e.g. not having to write u in front of every string or a more pleasant subprocess API or the fact that dicts in 3.6 keep their insertion order which makes debugging a bit easier. It adds up. But the big one is that Python 2.7 will go away at some point.