May I know what is the difference between the following 2 codes? Example 1 returns nothing in the preview window while Example 2 returns numbers in the preview window. Both examples pass though (ie. allow you to proceed to the next level)

1) **Example 1**

```
start_list = [5, 3, 1, 2, 4]
square_list = []
for numbers in start_list:
square_list.append(numbers**2)
print square_list.sort()
```

2) **Example 2**

```
start_list = [5, 3, 1, 2, 4]
square_list = []
for numbers in start_list:
square_list.append(numbers**2)
square_list.sort()
print square_list
```