Calling @classmethod of abstract super class error — Python

Question

I am trying to overwrite a classmethod as seen in the code below but am getting the following error

TypeError: must be type, not classobj

Why is this happening, and how can I fix it?

   class A(object):
       @classmethod
       def test(cls, data):
         pass


    class B(A):
       @classmethod
       def test(cls, data):
         pass


    class C(B):
       @classmethod
       def test(cls, data):
         # do something to data
         return super(B, cls).test(data)

Answer 1

super is an object, not a class. Since test is explicitly a class method, you need to call it using the class of super (in this case "A").

Try replacing the last line with return A.test(data)

Answer 2

super only works with new-style classes (which in the 2.x series means inheriting from object ), but A is an old-style class.

To fix it, replace class A(): with class A(object): .

Answer 3

A is an old-style class (it does not inherit from object ), but super can only be used with new-style classes. Just fix A :

class A(object):
    @classmethod
    def test(cls, data):
        pass