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Python String find() method

  • Difficulty Level : Basic
  • Last Updated : 05 Aug, 2021

Python String find() method returns the lowest index of the substring if it is found in a given string. If it is not found then it returns -1. 

Syntax:

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str.find(sub, start, end)



Parameters: 

  • sub: It’s the substring that needs to be searched in the given string. 
  • start: Starting position where the sub needs to be checked within the string. 
  • end: Ending position where suffix needs to be checked within the string. 

Note #1: If start and end indexes are not provided then by default it takes 0 and length-1 as starting and ending indexes where ending indexes are not included in our search. 

Returns: 

Returns the lowest index of the substring if it is found in a given string. If it’s not found then it returns -1.

Note #2: The find() method is similar to index(). The only difference is find() returns -1 if the searched string is not found and index() throws an exception in this case.

Example 1: find() With No start and end Argument

Python3




word = 'geeks for geeks'
  
# returns first occurrence of Substring
result = word.find('geeks')
print ("Substring 'geeks' found at index:", result )
  
result = word.find('for')
print ("Substring 'for ' found at index:", result )
  
# How to use find()
if (word.find('pawan') != -1):
    print ("Contains given substring ")
else:
    print ("Doesn't contains given substring")


Output: 

Substring 'geeks' found at index: 0
Substring 'for ' found at index: 6
Doesn't contains given substring

Example 2: find() With start and end Arguments

Python3




word = 'geeks for geeks'
  
# Substring is searched in 'eks for geeks' 
print(word.find('ge', 2)) 
  
# Substring is searched in 'eks for geeks' 
print(word.find('geeks ', 2)) 
  
# Substring is searched in 's for g' 
print(word.find('g', 4, 10)) 
  
# Substring is searched in 's for g' 
print(word.find('for ', 4, 11))


Output: 

10
-1
-1
6



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