This part of the tutorial has got me crazy yesterday. Do you know why the instruction say "Iterate through the words list and append each word to result."
Did they type this just to "trick" us to believe that the append-method should've been used? Since the append method doesn't work in this task?
"you can't append strings, only lists. The exercise requires you to += to extend the string. The wording of the exercise is confusing, for it asks you to append the words to the string - but good question, I experienced difficulty on the same task."