How do we retrieve one element from a list? How do we retrieve the last element of the list without computing its length explicitly?
To retrieve any element from a list, we can pass its index (order, starting with zero) in square brackets: mylist[0] will get the first element. Similarly, negative indices will return elements in reverse order—mylist[-1] will get the last element, no matter how many of them are stored.
How do we get all the elements of a list – except the first one and the last one – in reverse order?
For that, we can use slicing. In a slice, the first number represents the start, the second number represents the end, and the third one represents the step. A negative number will lead to the reverse order. Since we're using all three values and the step is negative, we need to swap the start and end values. Since the start is already...