Override Of Final Variable

What it does

Checks for class variables on subclasses that override a superclass variable that has been declared as Final.

Why is this bad?

Declaring a variable as Final indicates to the type checker that it should not be overridden on any subclass.

Example

from typing import Final


class A:
    X: Final[int] = 1


class B(A):
    X = 2  # error