From 68f6e9ac305b75a7aa8455977e35eeb942051959 Mon Sep 17 00:00:00 2001 From: M3talM0nk3y Date: Tue, 25 Oct 2022 23:31:16 -0400 Subject: [PATCH] Added function that checks if a string is an isogram (#7608) * Added function that checks if a string is an isogram. * Added wiki reference and fixed comments. * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Made function name more self-documenting. Raise ValueError if string contains 1 or more digits. Renamed file. Lowercase string inside function. * Removed check_isogram.py (file renamed). * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Fixed test failure. * Raise ValueError when string has non-alpha characters. Removed import. Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> --- strings/is_isogram.py | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 strings/is_isogram.py diff --git a/strings/is_isogram.py b/strings/is_isogram.py new file mode 100644 index 000000000..a9d9acc81 --- /dev/null +++ b/strings/is_isogram.py @@ -0,0 +1,30 @@ +""" +wiki: https://en.wikipedia.org/wiki/Heterogram_(literature)#Isograms +""" + + +def is_isogram(string: str) -> bool: + """ + An isogram is a word in which no letter is repeated. + Examples of isograms are uncopyrightable and ambidextrously. + >>> is_isogram('Uncopyrightable') + True + >>> is_isogram('allowance') + False + >>> is_isogram('copy1') + Traceback (most recent call last): + ... + ValueError: String must only contain alphabetic characters. + """ + if not all(x.isalpha() for x in string): + raise ValueError("String must only contain alphabetic characters.") + + letters = sorted(string.lower()) + return len(letters) == len(set(letters)) + + +if __name__ == "__main__": + input_str = input("Enter a string ").strip() + + isogram = is_isogram(input_str) + print(f"{input_str} is {'an' if isogram else 'not an'} isogram.")