The design of multiple inheritance is really really bad in python. The base classes almost need to know who is going to derive it, and how many other base classes the derived will derive, and in what order... otherwise super will either fail to run (because of parameter mismatch), or it will not call few of the bases (because you didn't write super in one of the base which breaks the link)!

This is why your code didn't work correctly. Because of the way diamond inheritance works in python, classes whose base class is object should not call super().__init__(). As you've noticed, doing so would break multiple inheritance because you end up calling another class's __init__ rather than object.__init__().

Jan 8, 2013 · Multiple inheritance super() initialization with different signatures -1 I have a multiple classes in python i.e class a, class b, class c, class d then how can i accassed the specific class method

This is known as "diamond inheritance" and it is a big problem for many multiple inheritance systems (like in C++). Python's collaborative multiple inheritance (with super()) lets you solve easily it in many cases (though that's not to say a cooperative multiple inheritance hierarchy is easy to design or always a good idea). –

Mar 2, 2015 · You could also set the other class's metaclass to ABCMeta so that all the multiple base classes's metaclass are ABCMeta. I had a similar problem when using multiple inheritance with: a class having a custom metaclass; a class having ABCMeta as metaclass; what I did to solve this was make my custom metaclass derive from ABCMeta.

Well, when dealing with multiple inheritance in general, your base classes (unfortunately) should be designed for multiple inheritance. Classes B and C in your example aren't, and thus you couldn't find a proper way to apply super in D.

Feb 9, 2014 · the method that is used when calling self.method() is the one belonging to A, or the first class in the list of inheritance: >>> C() hello from class a <__main__.C object at 0x10571e9d0> While this seems to be true in all my test cases, I can't find a place in the docs or online that it is actually safe across any platform and implementation of ...

Oct 11, 2018 · In Python, If I want to use type hint to specify that a variable must inherit classes A and B, how can I do it? I checked the typing module, it only has a Union which means the type of the variable can be any of the hint, not all of the hint. Creating a new class C which inherits A and B seems a solution, but looks cumbersome.

Dec 8, 2018 · Downvoting because this gives a misleading explanation of which method super will call and doesn't explain how to do cooperative multiple inheritance properly. In particular, if you try to multiple-inherit from a class that loops over __mro__ , your options for calling all ancestor methods properly suck; in particular, looping over __mro__ ...

I am trying to understand python's class inheritance methods and I have some troubles figuring out how to do the following: How can I inherit a method from a class conditional on the child's input...