How to call methods which are present in right side defined class. Python inheritance. multiple inheritance. Dimond scenario python inheritance

Question

I have a class which is inherited from two other classes. When I call the methods from the child class, It always calls the method which mentioned left side in in class definition.

I know this way Python works. It first check the method in left side class and then right side class.

But now I can't change my child class definition. Please get me some help, how can I call same method present in "Second" class.

I am bit new to Python. using python 2.7

class First(object):
    def get_details(self):
        print "This method gets called every time"
        print "I can't change my Child class structure" 

class Second(object):
    def get_details(self):
        print "But I want to call the same method of this class.. "
        print "Please let me know what can I do? How do I call method of second inherited class" 

class Child(First, Second):
    pass


child_obj = Child()
child_obj.get_details()

Answer 1

You can either call it directly:

Second.get_details(child_obj)

or use .mro() to get the method resolution order and chose the second parent:

Child.mro()[2].get_details(child_obj)

The method resolution order shows you search order of classes Python uses to find a method:

>>> Child.mro()
[__main__.Child, __main__.First, __main__.Second, object]

As soon as it found get_details() in this list it stops and uses it.

I would suggest to hide this logic in a method of Child:

class Child(First, Second):

    def get_details_second_1(self):
        """Option 1"""
        return Second.get_details(self)

    def get_details_second_2(self):
        """Option 2"""
        return Child.mro()[2].get_details(self)

child_obj = Child()
child_obj.get_details_second_1()
child_obj.get_details_second_2()