Attempting to apply Descriptor to all attributes, including those of nested classes. Here is my attempt:

class Descriptor:
    def __init__(self, name: str):
        self.name = name

    def __get__(self, instance, owner):
        value = super().__get__(self, instance, owner)
        print(f'Accessing {self.name} from {owner}: {value}')
        return value

    def __set__(self, instance, value):
        print(f'Setting {self.name} to {value}')
        return super().__get__(self, instance, owner)

class DescriptorMeta(type):
    def __new__(cls, name: str, bases: tuple[type, ...], dct: dict[str, Any]):
        for attr_name, attr_value in dct.items():
            if isinstance(attr_value, type):
                cls._process_group(attr_name, attr_value)
            elif not attr_name.startswith('__') and not callable(attr_value):
                dct[attr_name] = Descriptor(attr_name, config_file)
        return super().__new__(cls, name, bases, dct)

    @staticmethod
    def _process_group(base_name: str, group_class: type):
        for attr_name, attr_value in group_class.__dict__.items():
            if not attr_name.startswith('__') and not callable(attr_value):
                if isinstance(attr_value, type):
                    DescriptorMeta._process_group(attr_name, attr_value)
                else:
                    setattr(group_class, attr_name, Descriptor(f"{base_name}.{attr_name}"))

class Config(metaclass=DescriptorMeta):
    attr1 = 'val1'
    class Cls1:
        c1_attr1 = 'val2'
    class Cls2:
        class Cls3:
            c3_attr1 = 200
            c3_attr2 = 800

When accessing the attributes of nested classes from an instance of Config, it’s not working as expected. How do I solve this?

>>> Config.Cls1.c1_attr1 calls __get__ method of Descriptor. but,

>>> Config().Cls1.c1_attr1 doesn’t.