def?average(*args):
????s?=?0.0
????for?i?in?args:
????????s?+=?i
????if?len(args)==0:???#?判斷args?元組tuple的長度，如果0個元素，代表0分，所以平均分為0.0?或者寫成float(0)
????????print?0.0
????else:
????????print?(s?/?len(args))
average()
average(1,?2)
average(1,?2,?2,?3,?4)

len(args)鬼知道