Automatically call method after __init__ in child class

Question

I have the following code:

class Parent:
    def __init__(self) -> None:
        print(f"init Parent")

class Child(Parent):
    def __init__(self) -> None:
        super().__init__()
        print(f"init Child")

    def post_init(self):
        print(f"post init")

Child()

Here I get the output:

init Parent
init Child

Is it possible to modify the code in the Parent-class to call the post_init method from the Child-class automatically after the ___init___() of the Parent and the Child-class. I would like to have the following output:

init Parent
init Child
post init

I don't want to modify the Child-class!!! I have already tried to define a decorator in the Parent-class, but I failed.

EDIT:

The Parent-class is a pattern-class and is multiple used in multiple children. So I don't want to take care every time i use the Child-class. Is it possible on using the abstract-package?

Answer 1

You can also write code like this:

class Meta(type):
    def __call__(cls, *args, **kwargs):
        instance = super().__call__(*args, **kwargs)
        instance.post_init()
        return instance

class Parent(metaclass=Meta):
    def __init__(self) -> None:
        print(f"init Parent")

class Child(Parent):
    def __init__(self) -> None:
        super().__init__()
        print(f"init Child")

    def post_init(self):
        print(f"post init")

Child()