checkdigit: Check Digit Library for Data Validation

checkdigit is a Python library providing algorithms for various check digit standards, facilitating data validation and error detection. It supports algorithms like Luhn, ISBN, UPC, EAN, ISIN, Modulo 10, Modulo 11, GS1, and CRC. The current version is 0.5.0, with releases occurring periodically to introduce new features, fix bugs, and refine existing algorithms.