inherit.py

class Foo(object):
    inherited_classes = []
    fields = {}
    @classmethod
    def add_me(cls, subcls):
        cls.inherited_classes.append(subcls)
        print cls.inherited_classes
    @classmethod
    def add_field(cls, id_key)
        fields[cls] = id_key
        #Expected -> fields[SubFoo] = id_key
        
@Foo.add_me
class SubFoo(Foo):
    Foo.add_field("id")