Given answer, B, is correct. But keep in mind too that even if the 'for' statement is corrected, the string is immutable, so assigning a new value to s[i] will fail with "'str' object does not support item assignment. HTH

String is immutable

>>> s="abc" >>> for s in len(s): ... s[i] = s[i].upper() ... Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'int' object is not iterable

strings can actually be modified by this type of loop. But the loop itself doesn't work, because it's just one number, 3. If it was iterable, it would have worked. Try running this: s='abc' for i in s: s=s.upper() print(s) s is iterable, so the result is 'ABC'

It causes an exception because the string s is imutable so attempting to assign to s[i] will fail, however s[i].upper() will succesed

should be for i in range(len... B. The code will cause a runtime exception

[TypeError: 'int' object is not iterable] is returned because len(s) is an int - you can't iterate an int - it's not a collection data type.

Even if the code were s="abc" for i in range(len(s)): >>>>s[i] = s[i].upper() print(s) it would still throw error as below: Traceback (most recent call last): File "<string>", line 5, in <module> TypeError: 'str' object does not support item assignment which was my initial thought

Yes, Type Error. Answer is B