Currently we have Python 3.4 and 3.5. Python 3.6 was released recently. When we added 3.5, I thought it was a good idea to keep 3.4 around in case some packages need it. It turns out that nothing is using it in our tree.
Do we want to keep 3.4 and 3.5 around? There is a maintenance cost incurred at each new release, because their shared patches tend to diverge each time. If we should keep them, how should the package inheritance go? Now, it's like this: 2.7 < 3.5 < 3.4 If we kept them all, should 3.5 and 3.4 both inherit 3.6?
