here is the code for this

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

return ''.join(c.lower() if c.isupper() else c.upper() if c.islower() else c for c in s)

I'll be checking out some of these other scripts for performance. My concept - I thought it'd be fun to build off of the list index in my loop. It works. ChatGPT claimed that this list-driven syntax will have better performance than string concatenation, e.g. the += letter.lower() syntax.

def swap_case(s): newstring = list(s) # Create an empty string to store the new text

for index in range(len(newstring)):
    if newstring[index].isupper():
       newstring[index]= newstring[index].lower()
    else: 
        newstring[index]= newstring[index].upper()
return ''.join(newstring)  #Combining the separate characters back into a string

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

Problem itself is pretty straight forward you are given a string you gotta return the upper case letter if it has a lower case letter and lower case letter to upper case 1. Make an empty string 2. check if the current i'th letter is even a letter or it's some number it's not letter and leave it and append it as it's into the list , if it's a letter then simply check the letter is upper or lower if it's lower then make it upper if it's upper then make it lower 3. Return the list as a string format because the problem seeks a string def swap_case(s): s1 = [] for item in s: if item.isalpha(): if item.isupper(): s1.append(item.lower()) else: s1.append(item.upper()) else: s1.append(item) return ''.join(s1)

4. Code