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Python rindex

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The Python rindex method is one of the Python String Method used to return the index position of the last occurrence of a specified string. Python rindex function return ValueError if the specified string not found. In this section, we discuss how to write rindex Function in Python Programming with example.

TIP: The index position in the rindex Function start from 0, Not 1.

Python rindex Syntax

The syntax of the Python rindex function is

String_Value.RIndex(Substring, Starting_Position, Ending_Position)
  • String_Value: Please select the valid String literal.
  • Substring: Please specify the string you want to search for.
  • Starting_Position: This is an optional parameter. If you want to specify the starting point (starting index position), then Please specify the index value here. If you omit this parameter, the rindex Function considers Zero as a starting position.
  • Ending_Position: This is an optional parameter. If you want to specify the endpoint (Ending index position), then Please specify the index value here. If you omit this parameter, the rindex Function considers the highest index number.

Python rindex method Example

The following set of examples help you understand the rindex Function.

# Python RIndex Method Example

Str1 = 'We are abc working at abc company';

Str2 = Str1.rindex('abc')
print('First Output of a RIndex() method is = ', Str2)

# Performing RIndex() function directly
Str3 = 'Find Tutorial at Tutorial Gateway'.rindex('Tutorial')
print('Second Output of a RIndex() method is = ', Str3)

# Using First Index while finding the String
Str4 = Str1.rindex('abc', 12)
print('Third Output of a RIndex() method is = ', Str4)

# Using First & Second Index while finding the String
Str5 = Str1.rindex('abc', 2, 21)
print('Fourth Output of a RIndex() method is = ', Str5)

# Searching for Not existing Item
Str6 = Str1.rindex('Tutorial')
print('Fifth Output of a RIndex() method is = ', Str6)

OUTPUT

Python RIndex

ANALYSIS

First, it finds the last occurrence of a substring ‘abc’ inside the Str1 using rindex function and prints the output

Str2 = Str1.rindex('abc')
print('First Output of an Index() method is = ', Str2)

The rindex function allows us to use the Starting index position. By specifying the starting index position, we can increase performance.

Str4 = Str1.rindex('abc', 12)
print('Third Output of a RIndex() method is = ', Str4)

The Python rindex function allows us to use Starting and ending indices. By specifying the starting and ending index positions, we can increase performance. The following statement starts looking for ‘abc’ from index position 2 and ends at index position 21. As we all know, the second abc is in position 22. So, Python returns the index position of the first abc.

Str5 = Str1.rindex('abc', 2, 21)
print('Fourth Output of a RIndex() method is = ', Str5)

The following String Method statement is returning Value Error because, rindex function start looking for substring ‘Tutorial’ inside the Str1, which does not exist.

Str6 = Str1.rindex('Tutorial')
print('Fifth Output of a RIndex() method is = ', Str6)