4. Use @override for overridden methods

In Python 3.12 and later, use @override to mark methods that are intended to override a base-class method.

The decorator turns a design intention into something type checkers and reviewers can verify. That helps catch drift when a base-class method is renamed or a subclass method signature no longer matches.

Note

Python 3.12+

4.1. Don’t do this

class BaseFormatter:
    def format(self, value):
        return str(value)

class JsonFormatter(BaseFormatter):
    # overrides BaseFormatter.format
    def format(self, value):
        return f'"{value}"'

4.2. Do this

from typing import override

class BaseFormatter:
    def format(self, value):
        return str(value)

class JsonFormatter(BaseFormatter):
    @override
    def format(self, value):
        return f'"{value}"'