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Python String casefold() Method - GeeksforGeeks

Python String casefold() Method

Last Updated : 11 Apr, 2023

Python String casefold() method is used to convert string to lowercase. It is similar to the Python lower() string method, but the case removes all the case distinctions present in a string.

Python String casefold() Method Syntax

Syntax:  string.casefold()

Parameters: The casefold() method doesn't take any parameters.

Return value: Returns the case folded string the string converted to lower case.

Python String casefold() Method Example Python3
string = "GEEKSFORGEEKS"

print("lowercase string: ", string.casefold())

Output:

lowercase string: geeksforgeeks
Difference between casefold() and lower() in Python

Python String casefold() Method is more aggressive in conversion to lowercase characters because it tends to remove all case distinctions in a String.

Python3
string = "ß"

print("Using lower():", string.lower())
print("Using casefold():", string.casefold())

Output:

Using lower(): ß
Using casefold(): ss
Practical Example using Python String casefold() Method

Here, we have a Python String with characters of mixed cases. We are using the Python casefold() Method to convert everything to lowercase.

Python3
string = "WeightAGE oF THe DiScuSSiON"

print("Original String:", string)
# print the string after casefold transformation
print("String after using casefold():", string.casefold())

Output:

Original String: WeightAGE oF THe DiScuSSiON
String after using casefold(): weightage of the discussion


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