Answer
1) 6 elements
2) 0
3) 5
4) lst[2] = 12
5) lst[-2] = 10
Work Step by Step
1) We should use function len() to get the number of elements in a lst, also we can calculate them by hand. Lst contains 6 elements.
2) In python list indices starts at 0. The first element of list is at index 0
3)Accordingly, the index of the last element in lst is 5
4) lst[2] is the third element in lst. lst[2] = 12
5) Index value of -2 gives the second last element. lst[-2] = 10
