final.md

Final

Final is used in type hinting to indicate that a particular variable, class, or method should not be overridden or changed. It serves as a way to enforce certain aspects of the design of your code.

Final Variables

A variable annotated with Final indicates that its value should not be reassigned.

from typing import Final

MAX_SIZE: Final[int] = 100

Final Methods

When you annotate a method with Final, it indicates that the method should not be overridden in subclasses.

from typing import final

class Base:
    @final
    def my_method(self):
        print("This method should not be overridden.")

Final Classes

Final can also be used on classes to indicate that they should not be subclassed.

from typing import final

@final
class MyFinalClass:
    pass