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* pre-commit: Upgrade psf/black for stable style 2023 Updating https://github.com/psf/black ... updating 22.12.0 -> 23.1.0 for their `2023 stable style`. * https://github.com/psf/black/blob/main/CHANGES.md#2310 > This is the first [psf/black] release of 2023, and following our stability policy, it comes with a number of improvements to our stable style… Also, add https://github.com/tox-dev/pyproject-fmt and https://github.com/abravalheri/validate-pyproject to pre-commit. I only modified `.pre-commit-config.yaml` and all other files were modified by pre-commit.ci and psf/black. * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
41 lines
1.0 KiB
Python
41 lines
1.0 KiB
Python
def hamming_distance(string1: str, string2: str) -> int:
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"""Calculate the Hamming distance between two equal length strings
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In information theory, the Hamming distance between two strings of equal
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length is the number of positions at which the corresponding symbols are
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different. https://en.wikipedia.org/wiki/Hamming_distance
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Args:
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string1 (str): Sequence 1
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string2 (str): Sequence 2
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Returns:
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int: Hamming distance
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>>> hamming_distance("python", "python")
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0
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>>> hamming_distance("karolin", "kathrin")
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3
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>>> hamming_distance("00000", "11111")
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5
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>>> hamming_distance("karolin", "kath")
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Traceback (most recent call last):
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...
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ValueError: String lengths must match!
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"""
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if len(string1) != len(string2):
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raise ValueError("String lengths must match!")
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count = 0
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for char1, char2 in zip(string1, string2):
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if char1 != char2:
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count += 1
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return count
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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