# This is my approach, didn't take too much time but also wasn't tested thoroughly

## function to validate credit card number using Luhn's algorithm, the input must be in a list format"##

def card_validate(number):

sum = 0

for i in range(0, len(number)):

if i%2 == 0:

sum += number[i]

else:

sum += (number[i]%10 + number[i]//10)

if sum % 10 == 0:

return True

else:

return False

1 answers ( 0 marked as helpful)

I noticed that I forgot to multiply 2nd number by 2, so I corrected the code:

def card_validate(number):

sum = 0

for i in range(0, len(number)):

if i%2 == 0:

sum += number[i]

else:

n2 = 2* number[i]

sum += (n2%10 + n2//10)

if sum % 10 == 0:

return True

else:

return False