how to change uppercase to lowercase and lowercase to uppercase in python code example

Example 1: convert an array to uppercase or lowercase js

var fruits = ["Banana", "Orange", "Apple", "Mango"];
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string = fruits.join(' ').toUpperCase();
// Output"BANANA ORANGE APPLE MANGO"

Example 2: how to convert uppercase to lowercase and vice versa in python

def swap_string():
	s=input()
	swapped_string=""
	swapped_string+=s.swapcase()
    return swapped_string