What the highest fly is the difference between

return str(self._values)

And

return self._values.str()

AS THEY ARE THE SAME!!! FROM THE SAME METHOD IMPLEMENTAION!!!!!

I just solved this kata now after reading your comment on Dashboard - while I don't think that your way of commenting is going to be very popular, I somewhat agree with the comment regarding the toString() method as it's not super clear for a newbie that they should read the next part in the description:

in Python, this is a __str__ method etc.

but then again this is a 5 kyu kata so you're supposed to work a bit for your points and not be a complete newbie when it comes to OOP and working with classes (I say this as someone who has only been programming for 2 months myself - I personally learnt a lot from sticking with katas that I couldn't solve immediately and figuring stuff out myself).

I recommend that you read the official docs as you should find what you need to do here:

Learn about the __str__ method here

NO WAY SAME PROBLEM HERE

you need to code it your self. This KATA is broken worst pice of cake ever!

Agree!