ENH: Enhanced the problem set building on the image handing and arrays.
Illustrated dtypes, casting and their importance along with an example
using RGBA images. Also introduce edge detection.
def all_digits_even(n):
if n < 0: n = -n
while n > 0:
if n % 2 == 1:
return False
n /= 10
return True
i = 46
while i <= 94:
square = i * i
if all_digits_even(square):
print square
i += 2