CreditCard is a Python 3 module which can validate, generate and determine the format of credit card numbers using the Luhn algorithm.
To import the module add the following to your python file:
from creditcard import luhn
from creditcard.formatter import Formatter
formatter = Formatter()
The validator can be used to validate credit cards and calculate the Luhn check digit for a given number.
To validate a credit card number:
luhn.is_valid(number)
number is a string or integer which is the credit card number.
To calculate the Luhn check digit for a particular number:
luhn.calculate_check_digit(number)
Again, number is a string or integer. For this method, however, it is a partial credit card number. This method will return the check digit, which is the last digit of the card number, as an integer.
To generate a valid credit card number:
luhn.generate(length)
This method will return a valid credit card number as a string.
To check whether a number matches the format of a specified type of credit card use the following methods:
The following card number formats can be detected:
- visa
- visa electron
- mastercard
- amex (american express)
- maestro
- discover
A card number can be checked to be in one of these formats by using the method formatter.is_format(number), where format is the format you are checking.
Each of these method will return True or False depending on whether the given number
n matches the format tested. As with the Validator and Generator, n can be
either a string or an integer.
To check if the number matches any of the formats you can use the method formatter.get_format(number) which will return a list of all the formats that the number complies with. If the number is determined to not be any of the above formats then an empty list will be returned.