Python String Casefold() Method

Python Casefold() method returns a lowercase copy of the string. It is more simillar to lowercase method except it revomes all case distinctions present in the string.

For example in German, ‘β’ is equivelent to “ss”. Since it is already in lowercase, lowercase do nothing and prints ‘β’ whereas casefold converts it to “ss”.

Python String casefold() Method Syntax

It has the following syntax:

casefold()  

Parameters

No parameter is required.

Return Type

It returns lowercase string.

Python Version

This function was introduced in Python 3.3.

Different Examples for Python Sring casefold() Function

Here, we are going to take some examples to demonstrate the working of string casefold() function in Python.

Python String Casefold() Method Example 1

Let us take an example to illustrate the string casefold() function in Python.

# Python casefold() function example  

# Variable declaration  

str = "PYTHONAPP"  

# Calling function  

str2 = str.casefold()  

# Displaying result  

print("Old value:", str)  

print("New value:", str2)

Output:

Old value: PYTHONAPP
New value: pythonapp

Python String Casefold() Method Example 2

The strength of casefold, it not only converts into lowercase but also converts strictly. See an example below ‘β’ is converted into “ss”.

# Python casefold() function example  

# Variable declaration  

str = "PYTHONAPP - β"  

# Calling function  

str2 = str.casefold()  

# Displaying result  

print("Old value:", str)  

print("New value:", str2)

Output:

Old value: PYTHONAPP - β
New value: pythonapp ? ss

Python String Casefold() Method Example 3

If string is in camelcase, it still converts whole string into lowercase.

# Python casefold() function example  

# Variable declaration  

str = "PyThOnApP"  

# Calling function  

str2 = str.casefold()  

# Displaying result  

print("Old value:", str)  

print("New value:", str2)

Output:

Old value: PyThOnApP
New value: pythonapp