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# Simple function that converts uppercase characters to lowercase and vice versa.

# Author: jotslo

def change_case(string):

# Iterates through string, if character is lowercase, convert to upper else lower

new_string = [char.upper() if char.islower() else char.lower() for char in string]

# Joins list with an empty string to form the new string and return

return "".join(new_string)

print(change_case("Hello, world!")) # hELLO, WORLD!

print(change_case("TEST")) # test