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31 lines
872 B
Python
31 lines
872 B
Python
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"""
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wiki: https://en.wikipedia.org/wiki/Heterogram_(literature)#Isograms
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"""
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def is_isogram(string: str) -> bool:
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"""
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An isogram is a word in which no letter is repeated.
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Examples of isograms are uncopyrightable and ambidextrously.
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>>> is_isogram('Uncopyrightable')
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True
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>>> is_isogram('allowance')
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False
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>>> is_isogram('copy1')
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Traceback (most recent call last):
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...
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ValueError: String must only contain alphabetic characters.
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"""
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if not all(x.isalpha() for x in string):
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raise ValueError("String must only contain alphabetic characters.")
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letters = sorted(string.lower())
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return len(letters) == len(set(letters))
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if __name__ == "__main__":
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input_str = input("Enter a string ").strip()
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isogram = is_isogram(input_str)
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print(f"{input_str} is {'an' if isogram else 'not an'} isogram.")
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