Oops, having written the above comment, I belatedly remembered why I originally suggested this be handled as a maintenance issue rather than as a regular enhancement: I'd like to backport it to the Python 3.6 stack in Fedora, and I think it's better to do that kind of general 2->3 migration UX enhancement upstream (so everyone benefits), rather than as a downstream Fedora-specific patch (which both reaches a smaller audience and is more of a hassle to implement and maintain).

If anyone strongly objects to backporting it, I'm willing to go down the downstream patch path, but otherwise I'll backport it so it also shows up for everyone in 3.6.3 later in the year.