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Python String casefold() Method

  • Last Updated : 03 May, 2022

Python String casefold() method is used to implement caseless string matching. It is similar to lower() string method but case removes all the case distinctions present in a string. i.e ignore cases when comparing. 

Syntax: 

string.casefold()

Parameters:

The casefold() method doesn’t take any parameters.

Return value:

It returns the case folded string the string converted to lower case.

Example 1: Convert String in Lower Case

Python3




# Python program to convert string in lower case
string = "GEEKSFORGEEKS"
 
# print lowercase string
print("lowercase string: ",string.casefold())


Output:

lowercase string: geeksforgeeks

Example 2: Check if a string is palindrome 

Python3




# Program to check if a string
#  is palindrome or not
 
# change this value for a different output
str = 'geeksforgeeks'
 
# make it suitable for caseless comparison
str = str.casefold()
 
# reverse the string
rev_str = "".join(reversed(str))
# check if the string is equal to its reverse
if str == rev_str:
      print("palindrome")
else:
      print("not palindrome")


Output:

not palindrome

Example 3: Count Vowels in a String 

Python3




# Program to count
# the number of each
# vowel in a string
 
# string of vowels
v = 'aeiou'
 
# change this value for a different result
str = 'Hello, have you try geeksforgeeks?'
 
# input from the user
# str = input("Enter a string: ")
 
# caseless comparison
str = str.casefold()
 
# make a dictionary with
# each vowel a key and value 0
c = {}.fromkeys(v,0)
 
# count the vowels
for char in str:
          if char in c:
                  c[char] += 1
print(c)


Output:

{'a': 1, 'e': 6, 'i': 0, 'o': 3, 'u': 1}

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