Python - Numero de tarjeta

def verify(card_number):

    digits = [int(c) for c in card_number if c.isdigit()]

    # The first digit must be a 4.

    if 4 != digits[0]:

        return False

    # The fourth digit must be one greater than the fifth digit

    if digits[3] +1 != digits[4]:

        return False

    # The sum of all digits must be evenly divisible by 4

    if 0 != sum(digits)%4:

        return False

    # If you treat the first two digits as a two-digit number,

    # and the seventh and eighth digits as a two-digit number, their sum must be 100.

    first_group  = digits[0] * 10 + digits[1]

    second_group = digits[5] * 10 + digits[6]

    if 100 != first_group + second_group:

        return False

    return True

input = "5000-0000-0000" # change this as you test your function

output = verify(input) # invoke the method using a test input

print(output) # prints the output of the function

import re

def verify(number):

    '''

    Verifies a credit card number.

    number: str

    return: bool

    '''

    pattern = re.compile(r"\d{4}-\d{4}-\d{4}")

    if not pattern.match(number):   # checks the input format.

        return False

    digits = [int(char) for char in number if char.isdigit()]

    if digits[0] != 4:              # rule #1.

        return False

    if digits[3] - digits[4] != 1:  # rule #2.

        return False

    if sum(digits) % 4 != 0:        # rule #3.

        return False

    addition = (digits[0] + digits[6]) * 10 + (digits[1] + digits[7])

    if addition != 100:             # rule #4.

        return False

    return True

INPUT = "5000-0000-0000"            # change this as you test your function.

OUTPUT = verify(INPUT)              # invoke the method using a test input.

print(OUTPUT)                       # prints the output of the function.