validation.luhn
Check a digit string against the Luhn mod-10 checksum used by payment cards and many identifiers.
is_luhn in PythonTagged mod10
2 capabilities
validation.gs1-check-digit
Compute or check the GS1 mod-10 check digit of any GS1 key: GTIN, SSCC, GLN, GSRN, GDTI, GSIN and the rest.
A group of 2:
gs1_check_digit, is_gs1_check_digit_valid