Python OO program structure planning
问题 I'm a beginner in OOP and I want to create a program with three classes, A, B, and C. Each instance of the class is defined by a set of characteristics, Achar1, Achar2 etc. The program is supposed to create uses comprising of element of A, element of B and element of C with begin and end date. There are subclasses of A and B, so that some elements of A can only be connected to certain elements of B. The main functionality of the program is to list elements of A, B and C with their aributes,