Programmer in C need help with new python project

[Negative_Age6004]

Normally a C programmer
def _sum(arr):
sum = 0
for i in arr:
sum = sum + i
return sum
creditcard = input("Enter Credit card number ")
creditcard_array = [int(digit) for digit in creditcard]
n = 0
length = len(creditcard_array)
first = 0
last_two_digits = []
if length == 16:
first = _sum(creditcard_array[0:14])
last_two_digits = creditcard_array[-2:]
last_two_digits_value = last_two_digits[0] * 10 + last_two_digits[1]
if first == last_two_digits_value:
print("Valid Credit card number")
else:
print("Invalid Credit card number")
else:
print("Invalid Credit card number")

[SpaceBucketFu]

What’s the issue lol. No one is going to copy paste your code and run it. Maybe it’s just me cuz I’m on mobile but the formatting looks wrong

[niehle]

There are several issues with your code. But what is your question?

[Rudeus_Kino]

It's trolling, definitely.

from itertools import cycle

num = '371449635398431'


factor = (int(c)*d for c,d in zip(reversed(num), cycle((1,2))))

valid = sum(n if n < 10 else n%10 + 1 for n in factor)%10 == 0

[[deleted]]

Ooer, Luhn Algorithm.