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作业注意点

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def fact(n):
    '''
    Calculate 1*2*...*n
    
    >>> fact(1)
    1
    >>> fact(10)
    3628800
    >>> fact(-1)
    Traceback (most recent call last): #注意Traceback与()之间有一个空格!
       ...
    ValueError
    '''
    if n < 1:
        raise ValueError()
    if n == 1:
        return 1
    return n * fact(n - 1)

if __name__ == '__main__':
    import doctest
    doctest.testmod()

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