If it is, the credit card number is considered valid and the function returns True. The total sum of the undoubled and doubled digits is checked to see if it is divisible by 10.This is done using another list comprehension and the sum() function to add together the digits at even index positions in the digits list. The next step is to add the sum of the undoubled digits to the doubled_sum value.If the doubled digit is less than or equal to 9, it is added to a running total called doubled_sum. If it is, the individual digits of the doubled number are added together using list comprehension and the sum() function. This is done using another for loop and an if statement to check whether the current doubled digit is greater than 9. The next step is to add the digits of the doubled numbers together.If the digit is at an odd index position (i.e., the remainder of i % 2 is 1), the digit is doubled and added to a new list called doubled_digits. This is done using a for loop and the enumerate() function to iterate over the digits of the credit card number, and the % operator to check whether the current digit is at an odd or even index position. The first step in the Luhn algorithm is to double every second digit of the credit card number.If this sum is divisible by 10, the credit card number is considered valid. The Luhn algorithm works by doubling every second digit of the credit card number and then adding the resulting digits together to create a sum. After converting the credit card number to a list of integers, the validate_credit_card function proceeds to perform the Luhn algorithm for credit card validation.# Double every second digit doubled_digits = for i, digit in enumerate (digits): if i % 2 = 1 : doubled_digits.append(digit * 2 ) else : doubled_digits.append(digit) # Add the digits of the doubled numbers doubled_sum = 0 for d in doubled_digits: if d > 9 : doubled_sum += sum () else : doubled_sum += d # Add the sum of the undoubled digits undoubled_sum = sum () # Check if the total sum is divisible by 10 total_sum = doubled_sum + undoubled_sum if total_sum % 10 = 0 : return True else : return False This is a common format for performing credit card validation algorithms. The resulting digits list is now a list of integers representing the individual digits of the credit card number, in reverse order.This is done using list comprehension, which creates a new list by iterating over the characters in the reversed_number string and converting each character to an integer using the int() function.Once we have the reversed string, we need to convert it to a list of integers so that we can perform further calculations on the individual digits of the credit card number.In this case, we use a step value of -1 to specify that we want to extract the string in reverse order. This is done using Python’s slice notation, which allows us to extract a portion of a string by specifying a start index, stop index, and step value.# Reverse the card number reversed_number = card_number # Convert the reversed number to a list of integers digits = Īfter removing any whitespace from the card_number string, the next step in the credit card validation process is to reverse the string. Removing whitespace from the card_number string is an important step in the validation process because credit card numbers often have spaces between groups of digits for readability, but these spaces should not be considered as part of the actual credit card number when performing validation. This means that any spaces in the card_number string will be replaced with nothing, effectively removing them from the string. In this case, the first argument to replace() is a space character, and the second argument is an empty string. This is done using the replace() method, which replaces all occurrences of a specified substring with another substring. The first step in validating the credit card number is to remove any whitespace from the card_number string. The validate_credit_card function takes a card_number parameter, which is the credit card number to be validated. Def validate_credit_card ( card_number ): # Remove any whitespace from the card number card_number = card_number.replace( " ", "" )
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