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21 lines
437 B
Python
21 lines
437 B
Python
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def wave(txt: str) -> list:
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"""
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Returns a so called 'wave' of a given string
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>>> wave('cat')
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['Cat', 'cAt', 'caT']
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>>> wave('one')
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['One', 'oNe', 'onE']
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>>> wave('book')
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['Book', 'bOok', 'boOk', 'booK']
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"""
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return [
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txt[:a] + txt[a].upper() + txt[a + 1 :]
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for a in range(len(txt))
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if txt[a].isalpha()
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]
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if __name__ == "__main__":
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__import__("doctest").testmod()
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