#! /usr/bin/env python3
 
import random, sys
 
# メッセージ分離方式: 表示用メッセージは本体から分けておく(メインテナンスの為)
msg = {'start': 'じゃんけんスタート',
       'prompt': '自分の手を入力してください\n0:グー,1:チョキ,2:パー',
       'win': 'あなたの勝ちです',
       'lose': 'あなたの負けです',
       'continue?': '続けますか?',
       'wrong': '入力が間違っています',
       'y-or-n': 'YesかNoを入力して下さい(y/n)',
       'hand': 'コンピュータの手: {}',
       0: 'グー',
       1: 'チョキ',
       2: 'パー'}
 
# 環境データ
class Env(object):
    def __init__(self, lose = 0, win = 0, *hand):
        self.lose = lose
        self.win = win
        self.hand = hand
    def __repr__(self):
        return f'{self.win}勝{self.lose}敗'
 
# 入力関数(read)
def read(env):
    # 使いまわしの為 my_hand に代入
    my_hand = input(msg['continue?' if env.win == 5 or env.lose == 5 else 'prompt'])
    if my_hand.isalpha() or my_hand in map(str, (0, 1, 2)):
        return my_hand
    else:
        # 想定外の入力の際、例外を投げる
        raise ValueError
 
# プログラム本体: 計算処理だけ司り、入力も出力もしない
def result(my_hand, env):
    if env.win == 5 or env.lose == 5:
        # 使いまわしの為 my_hand に改めて代入
        my_hand = my_hand.lower()
        if my_hand == 'y' or my_hand == 'yes':
            return Env()
        elif my_hand == 'n' or my_hand == 'no':
            sys.exit()
    else:
        # 判定結果を二回使いまわしするので変数に代入
        hand = random.randint(0, 2)
        hand_diff = (int(my_hand) - hand + 3) % 3
        return Env(env.lose + 1 if hand_diff == 1 else env.lose,
                   env.win + 1 if hand_diff == 2 else env.win,
                   hand)
 
# 出力関数(print)
def display(env):
    # コンピュータの手を表示
    print(msg['hand'].format(msg[env.hand[0]]))
    # 三項演算子的な書き方
    print(msg['win'] if env.win == 5
          else msg['lose'] if env.lose == 5
          else env)
    return env
 
# プログラム実行部
if __name__ == '__main__':
    print(msg['start'])
    env = Env()
    while True:
        try:
            # env の値を更新する必要があるんで代入する
            env = display(result(read(env), env))
            # 以下、例外処理
        except ValueError:
            print(msg['wrong'])
        except AttributeError:
            print(msg['y-or-n'])
 

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