def fact(n):
'''
Calculate 1*2*...*n
>>> fact(1)
1
>>> fact(10)
3628800
>>> fact(-1)
Traceback(most recent call last):
if n < 1:
raise ValueError()
if n == 1:
return 1
return n * fact(n - 1)
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牛顿的烈焰激光剑
def fact(n):
'''
Calculate 1*2*...*n
>>> fact(1)
1
>>> fact(10)
3628800
>>> fact(-1)
Traceback(most recent call last):
'''
if n < 1:
raise ValueError()
if n == 1:
return 1
return n * fact(n - 1)