Python 3 - String rindex() Method

Description

The rindex() method returns the last index where the substring str is found, or raises an exception if no such index exists, optionally restricting the search to string[beg:end].

Syntax

Following is the syntax for rindex() method −

str.rindex(str, beg = 0 end = len(string))

Parameters

• str − This specifies the string to be searched.

• beg − This is the starting index, by default its 0

• len − This is ending index, by default its equal to the length of the string.

Return Value

This method returns last index if found otherwise raises an exception if str is not found.

Example

The following example shows the usage of rindex() method.

#!/usr/bin/python3

str1 = "this is really a string example....wow!!!"
str2 = "is"

print (str1.rindex(str2))
print (str1.rindex(str2,10))

Result

When we run above program, it produces the following result −

5
Traceback (most recent call last):
   File "test.py", line 5, in <module>
      print (str1.rindex(str2,10))
ValueError: substring not found