Sometimes, we want to move backward, i.e. starting with the very last symbol. Of course, we can count a number of symbols in a string, and then use it for our purposes. But it is a bit irrational, isn't it?

In Python, like for lists or tuples, we can access the very last element by using negative index -1. With negative indexing, enumeration starts with 1 this time, i.e. the very last element has index -1, the last but one -2, and so on...

Note

You can reverse a string by using [::-1]. This indexation means start at the end of string, end at the start (index 0), and move with step -1 (backward).