Practise Makes Perfect - is_prime

Oops, try again. Your function fails on is_prime(3). It returns None when it should return True.

```
Replace this line with your code.
def is_prime(x):
if x == 2:
return True
elif x < 2:
return False
elif x > 3:
for n in range(2, x-1):
if type(x % n) == 0:
return False
else:
return False
```