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

• Signature of find() method




# Signature of find method
 find(value)




Parameters	Description
value	This is a string value, which is searched in the invoked string and the method find() returns the first index of value(if found) in the invoked string object, otherwise -1 is returned.








• Example of find() method


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



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



# Creating a string
s1 = 'Decoding Python'


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

print('First Index of code in ',  s1 , ' : ' , index1)



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

print('First Index of Py in ', s1 ,  ' : ', index2)



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

print('First Index of thon in ', s1 ,  ' : ', index3)





Output is :




First Index of code in  Decoding Python  :  2
First Index of Py in  Decoding Python  :  9
First Index of thon in  Decoding Python  :  11





Program Analysis



String is initialized with value Decoding Python
• Index of the first occurrence of value coding in the string object is found 2.
• Index of the first occurrence of value Py in the string object is found 9.
• Index of the first occurrence of value thon in the string object is found, hence 11 is returned.







• If the searched value is not found, the -1 is returned


Here in this next example, we are searching for the index of a particular value in a string object using find() method. If the searched string is found, its first index is returned, otherwise the -1 is returned.



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



# Creating a string
s1 = 'Humpty Dumpty sat on a wall'


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

print('First Index of haha in ', s1 ,  ' : ', index1)





Output is :




First Index of haha in  Humpty Dumpty sat on a wall  :  -1






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

The rfind() method perform a case-sensitive search, when it comes to search an index of a specific value in a string object.

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


s1 = 'Rock and roll!'
s2 = 'Live a happy life!'

index1 = s1.find('ro')
index2 = s2.find('li')

print('First index of ro in ', s1, ' : ', index1)
print('First index of li in ', s1, ' : ', index2)

Output is :

First index of ro in  Rock and roll!  :  9
First index of li in  Rock and roll!  :  13

Program Analysis

First String is initialized with value Rock and roll!, second String is initialized with value Live a happy life!.
• Index of the first occurrence of value lower case ro in the first String object is found at index 9.
• Index of the first occurrence of value lower case li in the second String object is found at index 13.

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< String index() Method

String rfind() Method >

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