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35 lines
744 B
Python
35 lines
744 B
Python
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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 ValueError("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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