Mastering Object-Oriented Python - Second Edition

Overriding definitions for immutable objects

The following is a simple class hierarchy that provides us with definitions of __hash__() and __eq__():

import sysclass Card2:    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}"    def __eq__(self, other: Any) -> bool:        return (            self.suit == cast(Card2, other).suit            and self.rank == cast(Card2, other).rank        )    def __hash__(self) -> int:        return (hash(self.suit) + 4*hash(self.rank)) % sys.hash_info.modulusclass AceCard2(Card2):    insure =