在兩個級別輸入有效值之前，如何繼續要求輸入？

Question

我正在做一個問題，我為拼字游戲創建了各種功能。 首先，我想讓用戶輸入n或r或e以開始新游戲/重玩最后一局/結束游戲。

游戲開始后，我想請用戶輸入u或c以讓用戶或計算機玩游戲。

我陷入了問題的最后一部分。

我的代碼：

hand = None
while True:
    choice = input('Enter n to deal a new hand, r to replay the last hand, or e to end game: ').lower()
    if choice == 'e':
        break
    
    elif choice=='n':
        Your_choice = input('Enter u to play yourself or c to let the computer play: ')
        
        if Your_choice == 'u':
                hand = dealHand(HAND_SIZE)
                playHand(hand, wordList, HAND_SIZE)
        elif Your_choice == 'c':
                hand = dealHand(HAND_SIZE)
                compPlayHand(hand, wordList,HAND_SIZE)
        else:
                print('Invalid command.')
                
    elif choice == 'r':
        if hand == None:
            print('You have not played a hand yet. Please play a new hand first!')
        else:
            Your_choice = input('Enter u to play yourself or c to let the computer play: ')
            
            if Your_choice == 'u':
                if hand != None:
                    playHand(hand.copy(), wordList, HAND_SIZE)
                else:
                    print('You have not played a hand yet. Please play a new hand first!')
            elif Your_choice == 'c':
                if hand != None:
                    compPlayHand(hand.copy(), wordList, HAND_SIZE)
                else:
                    print('You have not played a hand yet. Please play a new hand first!')
            else:
                print('Invalid command.')
    else:
            print('Invalid command.')

如果內部循環的選擇不是u或c，則應反復通知和詢問，直到輸入為u或c。 但它在第一次審判后從那個循環中出來。

理想輸出：

Enter n to deal a new hand, r to replay the last hand, or e to end game: n
Enter u to have yourself play, c to have the computer play: x
Invalid command.

Enter u to have yourself play, c to have the computer play: y
Invalid command.

Enter u to have yourself play, c to have the computer play: z
Invalid command.

Enter u to have yourself play, c to have the computer play: k
Invalid command.

我的輸出：

Enter n to deal a new hand, r to replay the last hand, or e to end game: n

Enter u to play yourself or c to let the computer play: x

Invalid command.

Enter n to deal a new hand, r to replay the last hand, or e to end game: y

Invalid command.

問題是，當用戶在第二級輸入無效命令時，我的代碼開始詢問第一級的問題。

Answer 1

您需要的是 python 中的 break 語句，它會停止最內層的循環，然后您可以執行以下操作：

while:
    Your_choice = input('Enter u to play yourself or c to let the computer play: ')
    if Your_choice in ["u", "c"]:
        # Do stuff
        break
    else:
        print("Incorrect option")

文檔中的更多信息： https : //docs.python.org/3/tutorial/controlflow.html#break-and-continue-statements-and-else-clauses-on-loops