We all are so clever!)))

Look at my ■■■■-code.

```
def digit_sum(n):
if n<0:
return False
else:
total=len(str(n))
b=0
while total>0:
a=n%10
print a
b=b+a
n=n//10
total -=1
else:
print b
return b
digit_sum(434)
```