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Python String find()
  • Difficulty Level : Basic
  • Last Updated : 09 May, 2020

The find() method returns the lowest index of the substring if it is found in given string. If its is not found then it returns -1.
Syntax :

str.find(sub,start,end)

Parameters :

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

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



Returns:

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

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

CODE 1




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

CODE 2




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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