一个包含在游戏开始时显示菜单，以及在游戏过程中提供指导性建议，包含了六个选项：开始游戏，选牌，洗牌，显示我的牌，检查输赢，退出的纸牌游戏的游戏功能菜单代码，并且代码里不包含任何返回值

def display_menu():
    print("Welcome to the card game!")
    while True:
        print("Please choose an option:")
        print("1. Start game")
        print("2. Choose cards")
        print("3. Shuffle cards")
        print("4. Show my cards")
        print("5. Check win/lose")
        print("6. Quit")
        choice = input()
        if choice == "1":
            start_game()
        elif choice == "2":
            choose_cards()
        elif choice == "3":
            shuffle_cards()
        elif choice == "4":
            show_my_cards()
        elif choice == "5":
            check_win_lose()
        elif choice == "6":
            print("Goodbye!")
            break
        else:
            print("Invalid choice, please try again.")

def start_game():
    # start the game code here
    pass

def choose_cards():
    # choose cards code here
    pass

def shuffle_cards():
    # shuffle cards code here
    pass

def show_my_cards():
    # show my cards code here
    pass

def check_win_lose():
    # check win/lose code here
    pass

display_menu()