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Python Python Collections (2016, retired 2019) Slices sillyCase

Integers for index

It is telling me that I don't have integer indexes, but I used '//' I also tried this with the 'int()' function. Where is my error?


def sillycase(word):
    halfpoint = len(word)//2
    word[halfpoint:] = word[halfpoint:].upper()
    word[:halfpoint] = word[:halfpoint].lower()
    return word

2 Answers

28,558 Points

That is actually a generic error message that the challenge gives whenever your code does not work properly. The actual issue with your code is the fact that you try to modify the contents of the word string. Strings are immutable (meaning you cannot directly change them) so trying to modify the contents of the string like you are doing in your code is not valid.

If you either use separate variables to hold the two parts and then concatenate them like this:

def sillycase(word):
    halfpoint = len(word)//2
    upper_half = word[halfpoint:].upper()
    lower_half = word[:halfpoint].lower()
    return lower_half + upper_half

Or just concatenate the slices directly like this:

def sillycase(word):
    halfpoint = len(word)//2
    return word[:halfpoint].lower() + word[halfpoint:].upper()

Then your code will pass.

Interesting distinction between lists and strings. Thank you