As part of the work I'm doing on httplib3 (now that I've actually gotten a bit of time), one of the things I'm trying to get done is injection of httplib3 over http in order to not have to modify all import paths in modules and such. Here's the gist of what I have so far: https://gist.github.com/demianbrecht/bc6530a40718e4fcbf90.
It's greatly simplified over importlib2's inject mechanism, but I'm assuming that's largely due to requirements of that package (i.e. Python 2) in contrast to this one.
My questions are: Does this look sane? Is there anything that I might be not accounting for? It /does/ seem to work as expected when running tests, but I'm curious if there's anything that I might be missing that might jump out at someone more intimately familiar with the mechanics of importlib.