fun with masking and shifts

def chunkit(num):
    """
    retun list of 2 byte numbers
    0x12345678 = 0x78, 0x56, 0x34, 0x12
    """
    a = (num & 0xff000000) >> 24
    b = (num & 0x00ff0000) >> 16
    c = (num & 0x0000ff00) >> 8
    d = (num & 0x000000ff)
    return [d,c,b,a]