What does this script print?l1 = [1, 2, 3]l2 = l1l1.append(4)print(l2)

The script prints: [1, 2, 3, 4]

Here's the step by step explanation:

1. l1 = [1, 2, 3] : This line creates a list l1 with elements 1, 2, and 3.

2. l2 = l1 : This line creates a new reference l2 that points to the same list as l1. They are not two different lists, but two names pointing to the same list.

3. l1.append(4) : This line appends the integer 4 to the end of the list pointed to by l1. Since l2 points to the same list, the change is also reflected when we access the list using l2.

4. print(l2) : This line prints the list pointed to by l2, which is now [1, 2, 3, 4] due to the append operation on l1.