What are the "Max" and "gray" cases? When I add the "black" code shows an error!?

Question

https://code.sololearn.com/cgICUf72E39w/?ref=app

Answer 1

You have an error because your constructor only takes two arguments: name and color. You are passing it 3 arguments when you add "black". The self keyword as "argument" in the contructor just refers to the current object.
Note that though the method bark was defined this way: bark(self) you called it with no argument: bark(). If you tried to call bark with an argument you will have an error as well.

Answer 2

You are passing Three arguements insted of two. If You will pass only one color of your Dog class. This will compile.