Why would it matter if mercurial has python 3.x support? For writing hooks and extensions?
The mercurial team prioritized end-user features, like evolve, over moving to Python 3, which would only affect a very small number of mercurial users (mostly devs).
I've personally moved to Python 3 for most development and not once have I encountered a case where I couldn't do something in mercurial that would have been possible if the core code was on python 3.
Why would the CPython devs punish one of the largest and well known python projects by moving to a non-python DVCS? That would create an absolutely toxic effect in the python community.
They didn't move from mercurial because of python any more than they moved to Git because they like C.
