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Python String | rindex method

Programming
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Python
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Operations
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String Operations
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Documentation
schedule Mar 10, 2022
Last updated
local_offer Python
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Python's str.rindex(~) method returns the index of the last occurrence of the specified substring in the source string. If the substring is not found, ValueError exception is raised.

Parameters

1. sub | string

The substring to search for in the source string.

2. start | number | optional

The index of the source string from which to start the search (inclusive). Defaults to 0.

3. end | number | optional

The index of the source string at which to end the search (exclusive). Defaults to end=len(source string).

Return value

If the substring is found, then the index of the last occurrence of the substring in the source string.

If not found, then ValueError exception is raised.

Examples

Basic usage

To obtain the starting index of the last occurrence of "bc":

w = "abcdbc"
w.rindex("bc")
4

The last occurrence of "bc" in "abcdbc" occurs at index position 4 (after the 'd').

ValueError

To obtain the starting index of the last occurrence of "gg":

x = "abcdbc"
x.rindex("gg")
ValueError: substring not found

As "gg" was not found in "abcdbc", ValueError was raised.

Start parameter

To start searching from index 2 (inclusive):

y = "abcdbc"
y.rindex("bc", 2)
4

End parameter

To stop searching at index 3 (exclusive):

z = "abcdbc"
z.rindex("bc", 0, 3)
1

As the search ends at and is exclusive of index position 3 ('d'), the last occurrence of "bc" is at index 1.

robocat
Published by Isshin Inada
Edited by 0 others
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