Oops, try again. Your code looks a bit off. Check the console window for errors!
i think the iteration statement is correct but after there is something wrong
Replace this line with your code. n = [[1, 2, 3], [4, 5, 6, 7, 8, 9]] # Add your function here def flatten(lists): results=0 for numbers in lists: results.append(numbers) return results print flatten(n)