def swap_case(s): r="" for i in s: if(i==i.lower()): r+=i.upper() elif(i==i.upper()): r+=i.lower() else: r+=i result r

There is a method in python by which is swap_case(). You can use this instead of boring coding.

def swap_case(s):
    return s.swapcase()

if __name__ == '__main__':
    s = input()
    result = swap_case(s)
    print(result)

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

if name == 'main': s = input() result = swap_case(s) print(result)

def swap_case(s): swap = "" for char in s: if char.isupper(): swap = swap + char.lower() else: char.islower() swap = swap + char.upper() return swap