My main grip about #Python is this:
>>> v, u, s = (3, 2), (1, 2), 5
>>> v * s + u
(3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 1, 2)

...when I would like (3*5+1, 2*5+2), similar to what happens in #glsl and #math

(Just kidding, it's the lack of private mechanism that makes me the angriest)