Andrea Fontana:
I always think X < Y return a single bool,
Having a practice with NumPy and the like, I think X < Y as returning as many bools as the length of X and Y:
from numpy import * a = array([1, 5, 1]) b = array([1, 1, 5]) a < b
array([False, False, True], dtype=bool) Programmers with experience of Matlab, Matcad, etc, feel the same. Bye, bearophile
