On Mon, Aug 24, 2015, at 04:30 PM, Robert Collins wrote: > c) write convoluted tricky code to workaround the bugs and differing > behaviour on 3.4 vs 3.5. I use unittest.mock from Python 3.4 on several packages, and it has not required convoluted code. I would be very surprised if that code breaks when run under Python 3.5.