Question

Indentation in this group represents interface implementation: (In Python)

BagInterface
....ArrayBag
....LinkedBag

Indentation in this group represents inheritance:

AbstractCollection
....AbstractBag
........ArrayBag
............ArraySortedBag
........LinkedBag

Where are the more general (abstract) classes?
Where are the more specific (concrete) classes?

What are the benefits of this organization?
Does it have any detriments?

Can you think of any other bag classes that should be added to this class hierarchy?

Does AbstractBag implement BagInterface?
Why or why not?
What does this mean?

Why is there a __str__ method in both AbstractCollection and AbstractBag?
What is different about them?
What is the reasoning/motivation behind this difference?

Why is there an __eq__ method in both AbstractCollection and AbstractBag?
What is different about them?
What is the reasoning/motivation behind this difference?

Please answer questions that are in (BOLD) print... Thank You

Answer 1

The more general abstract classes are AbstractCollection and AbstractBag
The more general concrete classes are LinkedBag,ArrayBag,ArraySortedBag
Defining the classes and interfaces clearly will give a clear idea about the process and the use of each class
the classes ArrayBag and LinkedBag implementing interface BagInterface as well as extends AbstractBag class
some classes like TreeBag can be added
From the given hierarchy AbstractBag is not implementing bagInterface(ArrayBag and Linkedbag are implementing BagInterface)
Objects of different classes will have different string representations so every seperate class will have an __str__ methods
The __str__ method in AbstractCollection will define about all the collection of abstract classes and the __str__ method in AbstractBag will define about all the collection of Bag classes
The motivation for this is by defining these __str__ methods for each class their working procedure can be understood clearly
the method __eq__ is used to compare different classes so it can be implemented in every class so that it can make comparision with other classes
The __eq__ method in AbstractCollection will compare the values of its objects and values of variables to that of other classes like AbstractBag
the same happens with AbstractBag class
To make the comparision of objects easy.
If you have any doubts please comment and please don't dislike.