Use methods of parent class A from parent class B

Question

I have a class A:

class A(object):
   def pprint(x):
       print(x)

Then I have a class B:

class B(object):
    def pprint(x):
        x += 1
        # find a way to call A.pprint(x)

Then I have a child class:

class Child(B, A):
    pass

Which should be used:

child = Child()
child.pprint(1)
>>> 2

I can make changes to B but not to A. I cannot refer to A directly in B. B will never be instantiated directly, always via children class.

Answer 1

After the explanation - what you need is not super() you need something like sibling_super() to find the next class in the multiple inheritance chain. You can poll Python's MRO for that, for example:

class A(object):

    def pprint(self, x):  # just to make it valid, assuming it is valid in the real code
        print(x)

class B(object):

    @staticmethod
    def sibling_super(cls, instance):
        mro = instance.__class__.mro()
        return mro[mro.index(cls) + 1]

    def pprint(self, x):
        x += 1
        self.sibling_super(B, self).pprint(self, x)

class Child(B, A):
    pass

child = Child()
child.pprint(1)  # 2