https://qiita.com/Nuka-san-Engineering/items/857eb0be85fe7e95f9dd#comment-4b36f1043c7db0a20a4f

janken.py

import random


class Hand:

    def __init__(self, shape, stronger_than):
        self.shape = shape
        self._stronger_than = stronger_than

    def __repr__(self):
        return repr(self.shape)

    def __str__(self):
        return self.shape

    def stronger_than(self, enemy):
        return self._stronger_than == enemy.shape


HANDS = {1: Hand("グー", "チョキ"),
         2: Hand("チョキ", "パー"),
         3: Hand("パー", "グー")}


class Player:

    def __init__(self, name):
        self.name = name


class Human(Player):

    def pon(self):
        print('選択肢:', HANDS)
        while True:
            hand = input(f"{self.name}の出す手を入力してください(整数：1, 2, 3): ")
            if hand in ("1", "2", "3"):
                self.hand = HANDS[int(hand)]
                return


class Computer(Player):

    def pon(self):
        self.hand = random.choice(list(HANDS.values()))


class Janken:

    def __init__(self, players):
        self.players = players

    def play(self):
        print("じゃんけんぽん！")
        self.pon()
        while not (winners := self.winners()):
            print("\nあいこでしょ！！")
            self.pon()
        print(f"{'と'.join(winners)}の勝ち！")

    def pon(self):
        for player in self.players:
            player.pon()
        for player in self.players:
            print(f"{player.name}の手：{player.hand}")

    def winners(self):
        hands = set(player.hand for player in self.players)
        if len(hands) != 2:
            return None
        hand1, hand2 = hands
        win = hand1 if hand1.stronger_than(hand2) else hand2
        return [player.name for player in self.players if player.hand == win]


def janken():
    #players = Human("あなた"), Computer(f"コンピュータ")
    players = Human("あなた"), *[Computer(f"コンピュータ#{i}") for i in "123"]
    Janken(players).play()


if __name__ == "__main__":
    janken()