Mastering Object-Oriented Python - Second Edition

Inheriting definitions for immutable objects

Let's see how default definitions operate. The following is a simple class hierarchy that uses the default definitions of __hash__() and __eq__():

class Card:    insure = False    def __init__(self, rank: str, suit: "Suit", hard: int, soft: int) -> None:        self.rank = rank        self.suit = suit        self.hard = hard        self.soft = soft    def __repr__(self) -> str:        return f"{self.__class__.__name__}(suit={self.suit!r}, rank={self.rank!r})"    def __str__(self) -> str:        return f"{self.rank}{self.suit}"class NumberCard(Card):    def __init__(self, rank: int, suit: "Suit") -> None:        super().__init__(str(rank), suit, rank, rank)class AceCard(Card):    insure = True    def __init__(self, rank: int, suit: "Suit") -> None:        super().__init__ ...