how to change case of string in python code example

Example 1: python convert string to lowercase

# By Alan W. Smith and Petar Ivanov
s = "Kilometer"
print(s.lower())

Example 2: python string to lower

str = 'heLLo WorLD'
print(str.lower())
# hello world

Example 3: 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