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35 lines
550 B
Python
35 lines
550 B
Python
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"""
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Signum function -- https://en.wikipedia.org/wiki/Sign_function
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"""
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def signum(num: float) -> int:
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"""
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Applies signum function on the number
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>>> signum(-10)
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-1
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>>> signum(10)
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1
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>>> signum(0)
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0
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"""
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if num < 0:
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return -1
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return 1 if num else 0
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def test_signum() -> None:
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"""
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Tests the signum function
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"""
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assert signum(5) == 1
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assert signum(-5) == -1
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assert signum(0) == 0
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if __name__ == "__main__":
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print(signum(12))
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print(signum(-12))
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print(signum(0))
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