Ok here, there is something wrong with this for here is my code:

```
def square(n):
"""Returns the square of a number."""
squared = n**2
print "%d squared is %d." % (n, squared
return squared
square(10)
```

and the error says:

File "python", line 5

return squared

^

SyntaxError: invalid syntax

but return is a valid python keyword, right?