Python String | rindex method
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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.
