Python String casefold() Method
Example
Make the string lower case:
    txt = "Hello, And Welcome To My World!"
x = txt.casefold()
    print(x)
  Run example »
Definition and Usage
The casefold() method returns a string where 
all the characters are lower case.
This method is similar to the 
lower() method, but the
casefold() method is 
stronger, more aggressive, meaning that it will convert more characters into 
lower case, and will find more matches when comparing two strings and both are 
converted using the casefold() method.
Syntax
  
    string.casefold()
  
Parameter Values
No parameters

