# Pset6 credit python Problem

I try to convert my Credit Solution from C to Python now.

But on Line 19 ( doubleCheck = ccNumber[i] * 2 ) i always get the error "TypeError: 'int' object is not subscriptable"!

How can i fix this?

``````from cs50 import get_int
import sys

ccNumber = get_int("Please enter the cc number : ")

ccLength = len(str(ccNumber))

if ccLength != 13 and ccLength != 15 and ccLength != 16:
sys.exit()

firstSum = 0
secondSum = 0
doubleCheck = 0

for i in range(ccLength, -1, -1):
if i % 2 == 0:
secondSum = secondSum + ccNumber[i]
if i % 2 == 1:
doubleCheck = ccNumber[i] * 2
if doubleCheck >= 10:
firstSum = firstSum + (doubleCheck % 10)
firstSum = firstSum + (doubleCheck / 10)
else:
firstSum += doubleCheck;

totalChecksum = firstSum + secondSum

if totalChecksum % 10 == 0:
if ccNumber[0] == 3 and ccLength == 15:
if ccNumber[1] == 4 or ccNumber[1] == 7:
print("AMEX", end="");
elif ccNumber[0] == 4:
if ccLength == 13 or ccLength == 16:
print("VISA", end="")
elif ccNumber[0] == 5 and ccLength == 16:
if ccNumber[1] == 1 or ccNumber[1] == 2 or ccNumber[1] == 4 or ccNumber[1] == 5:
print("MASTERCARD", end="")
else:
print("INVALID", end="")
``````

The function `get_int` returns an integer and therefore if you wish to access each character by its corresponding index consider first casting it to a string.