Hi, can somebody help me? I don't know what I am doing wrong here.

My plan is to convert the integer into a string. Then to split each individual number into a list. Convert each string in the list to integers. Then take the sum of the list.

Error: 'Your function fails on digit_sum(434). It returns None when it should return 11.'

```
def digit_sum(n):
word = str(n)
wordn = list(word)
integers = [int(i) for i in wordn]
answer = sum(integers)
print answer
print digit_sum(434)
```