I am trying to learn about OOP and inheritance concepts as well as defining a function with an asterisk * before a variable (to unpack its values). When executing the toy code below, I got either an unexpected keyword argument or invalid syntax error.

I am trying to use inheritance in which I have a base class, say X, and 2 classes which both independently inherit from X, say A(X) and B(x) (these represent the common attributes of a whole bunch of tertiary classes, A1(A), A2(A), B1(B), etc.)