IMO we should merge this as is if the Windows part is OK, and change the default post-release to `python3` if we agree on it. The advantage I see with `python3` is that apparently it's gonna stay, and all distros I came across that support Python3 have that in path, even ye olde ones; but I think it's the kind of changes we should rather do early-ish -- e.g. right after the next release.