TheAlgorithms-Python

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def upper(word: str) -> str:
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    """
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    Convert an entire string to ASCII uppercase letters by looking for lowercase ASCII
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    letters and subtracting 32 from their integer representation to get the uppercase
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    letter.
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    >>> upper("wow")
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    'WOW'
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    >>> upper("Hello")
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    'HELLO'
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    >>> upper("WHAT")
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    'WHAT'
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    >>> upper("wh[]32")
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    'WH[]32'
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    """
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    return "".join(chr(ord(char) - 32) if "a" <= char <= "z" else char for char in word)
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if __name__ == "__main__":
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    from doctest import testmod
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    testmod()
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