Can someone explain why this wouldn't work in 4/15?

def digit_sum(n):

for x in str(n):

x = int(x)

return sum(x)

Can someone explain why this wouldn't work in 4/15?

def digit_sum(n):

for x in str(n):

x = int(x)

return sum(x)

If we break it down what your code is doing is:

```
def digit_sum(n): # Takes n as a parameter (with the assumption its an integer)
for x in str(n): # for each character in the string representation of the n integer
x = int(x) # take the integer representation of that character and reassign it to x
return sum(x) # return the sum of this one integer
```

The Python Documentation for sum() tells us that what we call it on needs to be an iterable and trying to call it on x while it is a single integer doesn't work.

A quick search in this forum brings up this post and having a look at it will surely help you