Since multiple inheritance is bad (it makes the source more complicated) C# does not provide such a pattern directly. But sometimes it would be helpful to have this ability. For instance I’m able to implement the missing multiple inheritance pattern using interfaces and three classes like that: public interface IFirst { void FirstMethod(); } public … Read more
Say I have a multiple inheritance scenario: class A(object): # code for A here class B(object): # code for B here class C(A, B): def __init__(self): # What’s the right code to write here to ensure # A.__init__ and B.__init__ get called? There’s two typical approaches to writing C‘s __init__: (old-style) ParentClass.__init__(self) (newer-style) super(DerivedClass, self).__init__() … Read more
What’s the difference between: class Child(SomeBaseClass): def __init__(self): super(Child, self).__init__() and: class Child(SomeBaseClass): def __init__(self): SomeBaseClass.__init__(self) I’ve seen super being used quite a lot in classes with only single inheritance. I can see why you’d use it in multiple inheritance but am unclear as to what the advantages are of using it in this kind … Read more
I’m pretty much new in Python object oriented programming and I have trouble understanding the super() function (new style classes) especially when it comes to multiple inheritance. For example if you have something like: class First(object): def __init__(self): print “first” class Second(object): def __init__(self): print “second” class Third(First, Second): def __init__(self): super(Third, self).__init__() print “that’s … Read more
In Programming Python, Mark Lutz mentions the term mixin. I am from a C/C++/C# background and I have not heard the term before. What is a mixin? Reading between the lines of this example (which I have linked to because it is quite long), I am presuming it is a case of using multiple inheritance … Read more
A Java class can only extend one parent class. Multiple inheritance (extends) is not allowed. Interfaces are not classes, however, and a class can implement more than one interface. The parent interfaces are declared in a comma-separated list, after the implements keyword. In conclusion, yes, it is possible to do: public class A implements C,D {…}
