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31 lines
758 B
Python
31 lines
758 B
Python
def factorial(n: int) -> int:
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"""
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Calculate the factorial of specified number
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>>> factorial(1)
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1
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>>> factorial(6)
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720
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>>> factorial(0)
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1
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>>> factorial(-1)
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Traceback (most recent call last):
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...
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ValueError: factorial() not defined for negative values
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>>> factorial(0.1)
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Traceback (most recent call last):
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...
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ValueError: factorial() only accepts integral values
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"""
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if n < 0:
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raise ValueError("factorial() not defined for negative values")
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if not isinstance(n, int):
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raise ValueError("factorial() only accepts integral values")
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return 1 if n == 0 or n == 1 else n * factorial(n - 1)
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if __name__ == '__main__':
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import doctest
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doctest.testmod()
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