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The rindex() string method determines the index of the last occurrence of a particular string value within the invoked string object.

• Signature of rindex() method




# Signature of rindex method
 rindex(value)




Parameters	Description
value	This is a string value, which is searched in the invoked string and the method rindex() returns the last index of value(if found), otherwise the error i.e. ValueError is reported.








• Example of rindex() method


We are searching for the index of a particular value in a string object using rindex() method. If the searched value is found in multiple indexes, its last index is returned.



# Python - Program to find a particular string value in a string.



# Creating a string
s1 = 'Work hard for your dreams'


# Finding the index of a value 'for' in the string
index1 = s1.rindex('for')

print('last index of for in ',  s1 , ' : ' , index1)



# Finding the index of a value 'ard' in the string
index2 = s1.rindex('ard')

print('last index of ard in ', s1 ,  ' : ', index2)



# Finding the index of a value 'r' in the string
index3 = s1.rindex('r')

print('last index of r in ', s1 ,  ' : ', index3)





Output is :




last index of for in  Work hard for your dreams  :  10
last index of ard in  Work hard for your dreams  :  6
last index of r in  Work hard for your dreams  :  20





Program Analysis



String is initialized with value Let us learn Python
• Index of the last occurrence of value for in the string object is found 10.
• Index of the last occurrence of value ard in the string object is found 6.
• Index of the last occurrence of value r in the string object is found, hence 20 is returned.







• If the searched value is not found, the ValueError is reported


Here in this next example, we are searching for the index of a particular value in a string object using rindex() method. If the searched string is found, its last index is returned, otherwise the ValueError is reported at the runtime of the program.



# Python - Program to find a particular string value in a string.



# Creating a string
s1 = 'Giving up is not a solution'


# Finding the index of a value 'haha' in the string
index1 = s1.rindex('zzz')

print('last index of Py in ', s1 ,  ' : ', index1)





Output is :




Traceback (most recent call last):
  File "D:/Python Programs/rindex2.py", line 10, in <module>
    index1 = s1.rindex('zzz')
ValueError: substring not found






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• Method rindex() performs a case-sensitive search.

Both forms of rindex() method perform a case-sensitive search, whether it comes to the search of an index of a value in a string object.

# Python - Program to find a particular value in a String.



# Creating the string
s1 = 'Do what you Love, love what you do'

# Searching for the value 'love'  in the string
index1 = s1.rindex('love')


# Searching for the value 'do' in the string
index2 = s1.rindex('do')


print('last index of love in ', s1, ' : ', index1)
print('last index of do in ', s1, ' : ', index2)

Output is :

last index of love in  Do what you Love, love what you do  :  18
last index of do in  Do what you Love, love what you do  :  32

Program Analysis

We have a string object, which is initialized with a value Do what you Love, love what you do.
• Index of the last occurrence of value lower case love in the first String object is found at index 18.
• Index of the last occurrence of value lower case do in the second String object is found at index 32.

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