Swap cases in a string

Question

I\'m trying to solve this challenge in hackerrank, which asks to convert all lowercase letters to uppercase letters and vice versa.

I attempt it with the following code:

Answer 1

def swap_case(s):
    a=" "
    for i in s:
        if i==i.lower():
            a=a+(i.upper())
        else:
            a=a+(i.lower())
    return (a)