You could do so much better than the python 2 to 3 transition. If the python 3 interpreter could still run python 2 code. If you could mix and match python 2 a

You could do so much better than the python 2 to 3 transition. If the python 3 interpreter could still run python 2 code. If you could mix and match python 2 and 3 code on a per-module, per-file or even per file basis, then the transition could have been so much smoother.