swap case python

1s=input()
2new_str=""
3for i in range (len(s)):
4    if s[i].isupper():
5        new_str+=s[i].lower()
6    elif s[i].islower():
7        new_str+=s[i].upper()
8    else:
9        new_str+=s[i]
10print(new_str)
11        
12        

1str_swapcase = "what was that about?".swapcase()
2print(str_swapcase)

1a = 10
2b = 20
3print("not swiped value of a is",a)
4print("not swiped value of b is",b)
5stored_value = a
6a = b
7b = stored_value
8print("swiped value of a is",a)
9print("swiped value of b is",b)
10
11

1def swap0(s1, s2):
2    assert type(s1) == list and type(s2) == list
3    tmp = s1[:]
4    s1[:] = s2
5    s2[:] = tmp
6    
7# However, the easier and better way to do a swap in Python is simply:
8s1, s2 = s2, s1

1def swap_string():
2	s=input()
3	swapped_string=""
4	swapped_string+=s.swapcase()
5    return swapped_string

1t = "Mr.Brown"
2nt = t.swapcase()
3print(nt)