recreate_mutable_attributes_meta.py

import collections.abc
from itertools import chain

MUTABLE_TYPES = tuple(
    filter(
        lambda item: isinstance(item, type) and item.__name__.startswith("Mutable"),
        collections.abc.__dict__.values(),
    )
)


class ClassAttributeFactory(type):
    def __prepare__(name, bases, **factory):
        if bases:
            mutable_attrs = chain.from_iterable(
                filter(
                    lambda attr: not attr[0].startswith("__")
                    and isinstance(attr[1], MUTABLE_TYPES),
                    vars(base).items(),
                )
                for base in bases
            )
            return {attr: value.copy() for attr, value in mutable_attrs}

        return {}


class Parent(metaclass=ClassAttributeFactory):
    items = []
    test = {}


class Child(Parent):
    pass


Parent.items.append(1)
Child.items.append(2)
assert Parent.items == [1]
assert Child.items == [2]
assert Child.items is not Parent.items
assert Child.test is not Parent.test