I Have Problem with lesson python, in the Practice Makes Perfect in the function

there’s my code

```
def cube(number):
n = number
if n % 3 == 0:
print "n divisible by 3"
else:
by_three(n)
return number
def by_three(number):
print "n is not"
return number
cube(6)
```

And the error result is “cube(2) returned 2 instead of 8”