The answer to your question depends on one very important aspect: Are your base classes designed for multiple inheritance? There are 3 different scenarios: The base classes are unrelated, standalone classes. If your base classes are separate entities that are capable of functioning independently and they don’t know each other, they’re not designed for multiple … Read more
What’s the difference? SomeBaseClass.__init__(self) means to call SomeBaseClass‘s __init__. while super().__init__() means to call a bound __init__ from the parent class that follows SomeBaseClass‘s child class (the one that defines this method) in the instance’s Method Resolution Order (MRO). If the instance is a subclass of this child class, there may be a different parent … Read more
This is detailed with a reasonable amount of detail by Guido himself in his blog post Method Resolution Order (including two earlier attempts). In your example, Third() will call First.__init__. Python looks for each attribute in the class’s parents as they are listed left to right. In this case, we are looking for __init__. So, … Read more
A mixin is a special kind of multiple inheritance. There are two main situations where mixins are used: You want to provide a lot of optional features for a class. You want to use one particular feature in a lot of different classes. For an example of number one, consider werkzeug’s request and response system. … Read more