式：
def incrementor8(n):
a = 0
result = []
while a < n:
result.append(a)
a += 8
return result
print(incrementor8(256))結果：
[0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120, 128, 136, 144, 152, 160, 168, 176, 184, 192, 200, 208, 216, 224, 232, 240, 248]