Error Message:

Oops, try again - Does your digit_sum function take exactly one argument (a positive

integer)? Your code threw a “‘int’ object is not callable” error.

I’ve looked at some of the other forum feeds for this and can’t work out where this is going wrong?! please help! x

```
def digit_sum(n):
num_str = str(n)
for i in range(len(num_str)):
total = 0
total += int(num_str[i])
return total
```