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  1. def fact(n):
  2.     '''
  3.     Calculate 1*2*...*n
  4.  
  5.     >>> fact(1)
  6.     1
  7.     >>> fact(10)
  8.     3628800
  9.     >>> fact(-1)
  10.     Tracbackv (most recent call last)
  11.     ···
  12.     ValueError
  13.     '''
  14.     if n < 1:
  15.         raise ValueError()
  16.     if n == 1:
  17.         return 1
  18.     return n * fact(n - 1)
  19.  
  20. if __name__ == '__main__':
  21.     import doctest
  22.     doctest.testmod()
  23.  
  24. # your code goes here
Success #stdin #stdout 0.44s 21412KB
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https://ideone.com/eICg2T
language:
Python 3 (python  3.12)
created:
5 days ago
visibility:
public

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