luhnalgorithmproof's Introduction

LuhnAlgorithmProof

Python 3.4 Implementation of the Luhn Algorithm

Python3 system to validate (return True) or reject (return False) a Luhn Compliant Account Number.
Checks 14, 15, or 16 digit card numbers to determine if the number is Luhn compliant.
For details on the formula see: https://en.wikipedia.org/wiki/Luhn_algorithm

Where cardNumber is intended to be an account number (received as a string)
without white space, or separator marks:

The following numbers act as a testable demonstration
cardNumber = '111111111111119' # Luhn Valid Number
cardNumber = '111111111111111' # Invalid Luhn Number
cardNumber = '1111-111111-11119' # Luhn Valid Number but invalid format
cardNumber = '2222222222222224' # Luhn Valid Number
cardNumber = '2222222222222222' # Invalid Luhn Number
cardNumber = '2222-2222-2222-2224' # Luhn Valid Number but invalid format
cardNumber = '33333333333330' # Luhn Valid Number
cardNumber = '33333-33333-3330' # Luhn Valid Number but invalid format
cardNumber = '33333333333333' # Invalid Luhn Number

Luhn Algorithm Compliant Credit Card Types (Partial List)
see: https://en.wikipedia.org/wiki/Bank_card_number (8/2015)

Card Type, Account Digit Length
American Express, 15
Bankcard, 16
Diners Club Carte Blanche, 14
Diners Club International, 14
Diners Club United States & Canada, 16
Discover Card, 16
InstaPayment, 16
JCB, 16
Dankort, 16
MasterCard, 16
Visa, 16
UATP, 15

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