Question

I would like to make a child class that has a method of the parent class where the method is a ‘classmethod’ in the child class but not in the parent class.

Essentially, I am trying to accomplish the following:

class foo(Object):     def meth1(self, val):         self.value = val  class bar(foo):     meth1 = classmethod(foo.meth1) 

Answer 1

I’m also not entirely sure what the exact behaviour you want is, but assuming its that you want bar.meth1(42) to be equivalent to foo.meth1 being a classmethod of bar (with ‘self’ being the class), then you can acheive this with:

def convert_to_classmethod(method):     return classmethod(method.im_func)  class bar(foo):     meth1 = convert_to_classmethod(foo.meth1) 

The problem with classmethod(foo.meth1) is that foo.meth1 has already been converted to a method, with a special meaning for the first parameter. You need to undo this and look at the underlying function object, reinterpreting what ‘self’ means.

I’d also caution that this is a pretty odd thing to do, and thus liable to cause confusion to anyone reading your code. You are probably better off thinking through a different solution to your problem.