Python String rindex() Method

Last Updated : 31 Dec 2025

Python rindex() method works same as the rfind() method except it throws error ValueError. This method throws an exception ValueError if the substring is not found. The syntax is given below.

Syntax of Python String rindex() Function

It has the following syntax:

Parameters

sub: substring to be searched.

start (optional): starting index to start searching.

end (optional): end index where to search stopped.

Return

It returns either index of substring or throws an exception ValueError.

Different Examples for Python String rindex() Method

Let's see some examples of rindex() method to understand it's functionality.

Example 1

A simple example is created first to see how to implement this method. This method returns index of the substring.

Output:

Example 2

This method accept parameters start and end index to search subtring from the substring. See the example below.

Output:

Example 3

If the substring is not found in the string, it raises ValueError. See the example below.

Output:

ValueError: substring not found