@xtreak
Understood, just as an aftermath:
I still disagree a little with such an implementation because it's riding way into terse-coding that it's going against the principles of mathematics, which is the basis of computer science and programming.
Python can use another special keyword or something(e.g. the Ellipsis notation) for this and all similar cases.
You'll get into trouble if you wanna explain such a thing to a mathematician or if you wanna write some pseudo-code based on it, which in both cases they're not gonna look at the underlying implementation.
A bad practice in C, followed by CPython spreaded to others.