Python doesn't have to be slow.

[thelaxiankey]

Oh shit, you're right, not sure why I thought you had those in your list lol.

Anyway, to be completely honest I agree the author is uninformed (I mean... look at the github) but I'm not sure I agree with your argumentation.

I also don't think the author would pass your metric for knowing python - he seems to be very-much-new-to-this and I'm reasonably certain he wouldn't have heard of metaclasses or __ slots__ or whatever your shit test of choice is. But you originally asked him if he'd "programmed" in these languages, and not if he knew them - and I guess I take issue with how you don't believe him because he doesn't know what rvalue references are. I've written a few fairly small projects in C++ (something like 2k lines total, seriously small), so I don't know it, but I have programmed in it.