def fact(n):
'''
Calculate 1*2*...*n
>>> fact(1)
1
>>> fact(10)
3628800
>>> fact(-1)
Traceback (most recent call last):
...
ValueError: invalid argument '-1'
if n < 1:
raise ValueError('invalid argument \'%s\'' %n)
if n == 1:
return 1
return n * fact(n - 1)
Sign in to make a reply
这样的话17422
def fact(n):
'''
Calculate 1*2*...*n
>>> fact(1)
1
>>> fact(10)
3628800
>>> fact(-1)
Traceback (most recent call last):
...
ValueError: invalid argument '-1'
'''
if n < 1:
raise ValueError('invalid argument \'%s\'' %n)
if n == 1:
return 1
return n * fact(n - 1)