I actually got confused by the "names" illustrations, even though I know Python. And the illustration doesn't really explain what is the observable difference between Python and "other languages".

I suppose the point is that Python doesn't support "pass by referece"-semantics, and that assignment never copies mutable values. However, AFAIK this is exactly the same as at least Java and JavaScript, and probably other languages too (I would guess Ruby and Lisp also, although I'm not sure).