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* Use TypeError for non-string input in count_vowels * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Fix docstring and improve input validation in kth_lexicographic_permutation * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Update kth_lexicographic_permutation.py --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Maxim Smolskiy <mithridatus@mail.ru>
35 lines
743 B
Python
35 lines
743 B
Python
def count_vowels(s: str) -> int:
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"""
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Count the number of vowels in a given string.
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:param s: Input string to count vowels in.
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:return: Number of vowels in the input string.
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Examples:
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>>> count_vowels("hello world")
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3
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>>> count_vowels("HELLO WORLD")
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3
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>>> count_vowels("123 hello world")
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3
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>>> count_vowels("")
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0
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>>> count_vowels("a quick brown fox")
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5
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>>> count_vowels("the quick BROWN fox")
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5
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>>> count_vowels("PYTHON")
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1
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"""
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if not isinstance(s, str):
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raise TypeError("Input must be a string")
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vowels = "aeiouAEIOU"
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return sum(1 for char in s if char in vowels)
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if __name__ == "__main__":
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from doctest import testmod
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testmod()
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