![]() ![]() append ( digit * 2 ) else : doubled_second_digit_list. argv def sum_digits ( digit ): if digit < 10 : return digit else : sum = ( digit % 10 ) + ( digit // 10 ) return sum def validate ( cc_num ): # reverse the credit card numberĬc_num = cc_num # convert to integer listĬc_num = # double every second digitĭoubled_second_digit_list = list () digits = list ( enumerate ( cc_num, start = 1 )) for index, digit in digits : if index % 2 = 0 : doubled_second_digit_list. ![]() """ print ( msg ) def get_cc_number (): if len ( sys. Now, subtract the digits greater than 9 from 9. After that, multiply all of the odd digits by two. The next step is to reverse all the digits. First of all, eliminate the last digit from the card number. Python3 credit_card_validator credit_card_number You can understand how the Luhn algorithm works by following the method discussed below. Python script to check the validity of credit card numbers Python Script to validate credit card number: You can validate the number by visiting this site. You can use tools available online to validate that the number generated is valid as per Luhn's algorithm or not.
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