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Python String | rfind 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.rfind(~) method returns the index of the last occurrence of the specified substring in the source string. If the substring is not found, then -1 is returned.

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 (start of source string).

3. end | number | optional

The index of the source string at which to end the search (exclusive). Defaults to len(source string) + 1.

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 -1 is returned.

Examples

Basic usage

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

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

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

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

x = "abcdbc"
x.rfind("gg")
-1

As "gg" was not found in "abcdbc", -1 is returned.

Start parameter

To start searching from index 2 (inclusive):

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

End parameter

To stop searching at index 3 (exclusive):

z = "abcdbc"
z.rfind("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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