7-3:4人じゃんけん｜紙とえんぴつで学ぶアルゴリズムとフローチャート

import random

hands = ["", "", "", ""]
winner_flags = [True, True, True, True]

# じゃんけんを続けるかどうか判定する
# 勝ち残った人が1人ならFalse, 2人以上ならTrueを返す
def check_continue(flags):
  winner_count = 0
  for flag in flags:
    if flag == True:
      winner_count += 1
  if winner_count == 1:
    return False
  else:
    return True


# じゃんけんの結果、勝った手を判定する
# 勝った手「グー」「チョキ」「パー」のいずれかを返す
# あいこのときは""（空の文字列）を返す
def get_winner_hand(check_hands):
  hand_gu = False
  hand_choki = False
  hand_pa = False
  winner = ""

  for hand in check_hands:
    if hand == "グー":
      hand_gu = True
    elif hand == "チョキ":
      hand_choki = True
    elif hand == "パー":
      hand_pa = True

  if hand_gu == True and hand_choki == True and hand_pa == False:
    #グーとチョキのとき
    winner = "グー"
  elif hand_gu == False and hand_choki == True and hand_pa == True:
    #チョキとパーのとき
    winner = "チョキ"
  elif hand_gu == True and hand_choki == False and hand_pa == True:
    #グーとパーのとき
    winner = "パー"

  return winner


print("じゃんけんぽん")

while check_continue(winner_flags):

  winners = ""
  for i in range(4):
    if winner_flags[i] == True:
      if i == 0:
        winners += "あなた "
      else:
        winners += "コンピュータ" + str(i) + " "

  print("==========")
  print("じゃんけんは" + winners + "で行います。")
  print("==========")


  #hands[0]:自分の手、hands[1]～hands[3]:コンピュータ1～3の手
  hands = ["", "", "", ""]
  if winner_flags[0] == True:
    hands[0] = input("自分の手を「グー」「チョキ」「パー」で入力してください==>")

  for i in range(1, 4):
    if winner_flags[i] == True:
      hands[i] =  ["グー", "チョキ", "パー"][random.randint(0, 2)]

  for i in range(4):
    if hands[i] != "":
      if i == 0:
        print("あなたの手：" + hands[i])
      else:
        print("コンピュータ" + str(i) + "の手：" + hands[i])

  winner_hand = get_winner_hand(hands)
  if winner_hand == "":
    #あいこのとき
    print("あいこでしょ！")

  else:
    for i in range(4):
      if hands[i] != winner_hand:
        winner_flags[i] = False


if winner_flags[0] == True:
  print("あなたの勝ちです。")
else:
  for i in range(1, 4):
    if winner_flags[i] == True:
      print("コンピュータ" + str(i) + "の勝ちです。")