upper case and lower case conversion in python

def swap_case(s):

    a = ""

    for i in s:

        if i.isupper() == True:

            a+=(i.lower())

        else:

            a+=(i.upper())

    return a

    

if __name__ == '__main__':

    s = input()

    result = swap_case(s)

    print(result)