How to obtain the last index of a list?

Question

Suppose I\'ve the following list:

list1 = [1, 2, 33, 51]
                    ^
                    |
indices  0  1   2   3

How do I obtain the

Answer 1

You can use the list length. The last index will be the length of the list minus one.

len(list1)-1 == 3