打破外部循環Python函數的其他選項

Question

我有一些代碼：

def playAgain1():
    print("Would you like to keep boxing or quit while you are ahead? (y/n)")
    playAgain = input().lower()
    if(playAgain.startswith('y') == False):
        print("Whatever you chicken.")
        break

如果playAgain()不以y開頭，我希望它能打破循環。 每當我嘗試，我都會收到錯誤：

在外面循環'打破'

我怎么能寫得更好才能使它工作？

Answer 1

正如馬特布萊恩特的回答所說，你不能在一個循環之外突破，但可以從函數返回。 我想補充一點，您可能需要從函數中返回一個值，以便主程序循環知道是返回start還是退出：

def main():
    while True:
        # main game code goes here
        if not playAgain():
            break

def playAgain():
    print("Would you like to keep boxing or quit while you are ahead? (y/n)")
    response = input().lower()
    return response.startswith('y')

Answer 2

用return break 。 break只能在循環中使用，而return只能在函數中的任何位置使用。 最終的代碼如下所示：

def playAgain1():
    print("Would you like to keep boxing or quit while you are ahead? (y/n)")
    playAgain = input().lower()
    if not playAgain.startswith('y'):
        print("Whatever you chicken.")
        return
    else:
        # do whatever you do when they say yes