PYTHON

converting capital letters to lowercase and viceversa in python

s=input()
new_str=""
for i in range (len(s)):
    if s[i].isupper():
        new_str+=s[i].lower()
    elif s[i].islower():
        new_str+=s[i].upper()
    else:
        new_str+=s[i]
print(new_str)
        
        

how to convert lower case to upper case in python

a = "Hello, World!"
print(a.upper())
#output: HELLO, WORLD!