The Python rindex function operates similarly to the rfind function with one key difference: it raises a ValueError when the specified substring cannot be located. Below is the syntax for using this method.
Syntax of Python String rindex Function
It has the following syntax:
rindex(sub[, start[, end]])
Parameters
sub: substring to be searched.
start (optional): the index from which to begin the search.
end (optional): the index at which the search ceases.
Return
It either provides the index of the substring or raises a ValueError exception.
Different Examples for Python String rindex Method
Let’s explore a few instances of the rindex method to gain a better understanding of how it operates.
Example 1
To begin, we will create a straightforward example to demonstrate the implementation of this method. This method provides the index of the specified substring.
# Python rindex() method example
# Variable declaration
str = "It is technical tutorial"
# calling function
str2 = str.rindex("t") # No start and end is given
# displaying result
print(str2)
Output:
Example 2
This approach takes in two parameters: the starting index and the ending index, which are utilized to locate a substring within the original string. Refer to the example provided below.
# Python rindex() method example
# Variable declaration
str = "It is technical tutorial"
# calling function
str2 = str.rindex("t") # No start and end is given
# displaying result
print(str2)
str2 = str.rfind("t",5,15) # Start is end both are given
print(str2)
Output:
18
6
Example 3
In the event that the substring is absent from the string, a ValueError is raised. Refer to the example provided below.
# Python rindex() method example
# Variable declaration
str = "Hello C Language"
# calling function
str2 = str.rindex("t") # No start and end is given
# displaying result
print(str2)
str2 = str.rfind("t",5,15) # Start is end both are given
print(str2)
Output:
ValueError: substring not found
