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is_isbn_10('080442957X')andis_isbn('080442957X')currently returnFalsebecause the checksum loop tries to convert the finalXwithint().Treat an uppercase
Xin the tenth position as 10, as specified in the Library of Congress ISBN structure documentation. Other positions and lowercasexremain invalid, and the ISBN-13 calculation is unchanged.Tests cover two valid X-ending ISBNs, hyphen normalization, disabled normalization, an incorrect checksum, and misplaced/repeated X characters. Four assertions fail before the fix; all 409 tests pass with
python -m unittest discoveron Python 3.13.