Description

1. Create an empty list called my_list.
2. Append the following elements to my_list: 10, 20, 30, 40.
3. Insert the value 15 at the second position in the list.
4. Extend my_list with another list: [50, 60, 70].
5. Remove the last element from my_list.
6. Sort my_list in ascending order.
7. Find and print the index of the value 30 in my_list.