ENH: Added slides for FFT and basic signal processing, wherein we
introduce some random number generation also. Misc. cleanup for
tutorial.
def all_digits_even(n): if n < 0: n = -n while n > 0: if n % 2 == 1: return False n /= 10 return Truei = 46while i <= 94: square = i * i if all_digits_even(square): print square i += 2