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交作业

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YSK射手

#1 Created at ... [Delete] [Delete and Lock User]

def fact(n): '''

>>> fact(0)
Traceback (most recent call last):
    ...
ValueError
>>> fact(1)
1
>>> fact(3)
6
'''
if n<1:
    raise ValueError()
if n==1:
    return 1
return n*fact(n-1)

if name=='main': import doctest doctest.testmod()

浅笑无痕_65683

#2 Created at ... [Delete] [Delete and Lock User]

Traceback (most recent call last): ... ValueError 这个是怎么得来的呢？哪章有将？麻烦了，谢谢

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