Python 3.12: @override for Static Typing

One more valuable addition to Python’s Typing ecosystem in Python 3.12

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Python 3.12 is officially releasing on October 2, 2023, let’s dive into one of the improvements in typing module.

Introduction of @override in Inheritance

A new decorator (@override) is introduced as part of PEP 698 focusing on reducing run time errors in Inheritance. Let’s see how to use `override` in Inheritance.

from typing import override

class Parent:
    def foo(self) -> int:
        return 1

class Child(Parent):
    @override
    def foo(self) -> int:
        return 2

When Child Class overrides any methods from Parent class, You can decorate it with @override saying that the parent class method been overridden.

Is it mandatory to use @override in Child class while overriding the methods?

No! Its optional, similar to other type checking in Python.

So What’s the big deal if its not mandatory?

Let’s imagine, the methods in Parent class is renamed to new_foo from foo, since child class method is already decorated with override, this raises