Clean Code in Python

Method Resolution Order (MRO)

Some people don't like multiple inheritance because of the constraints it has in other programming languages, for instance, the so-called diamond problem. When a class extends from two or more, and all of those classes also extend from other base classes, the bottom ones will have multiple ways to resolve the methods coming from the top-level classes. The question is, which of these implementations is used?

Consider the following diagram, which has a structure with multiple inheritance. The top-level class has a class attribute and implements the __str__ method. Think of any of the concrete classes, for example, ConcreteModuleA12—it extends from BaseModule1 and BaseModule2, and each one of them will take the ...