我如何修復我的while循環

我正在編寫一個程序，要求用戶輸入密碼。如果密碼與我設置的常量相匹配，則會打印出「已成功登錄的消息」。但是，如果密碼不正確，則會提供剩餘猜測次數，並要求用戶再次嘗試。該程序應該在3次錯誤猜測後結束，但即使經過3次嘗試後仍會繼續詢問。我認爲問題出在我的while循環中，但我不確定。我如何修復我的while循環

代碼：

def main(): 
    PASSWORD = "apple" 
    ALLOWED = 3 

    password = input("Enter the password: ") 
    while password != PASSWORD : 
     ALLOWED = ALLOWED - 1 
     print("Wrong. You have", ALLOWED, "guesses left") 

     if ALLOWED == 0: 
        print("You have been locked out") 
     password = input("Enter again ")    


    print("You have successfully logged into the system") 



main()

來源

2015-10-08 Steve

你不破環了似乎輕鬆了不同版本時沒有可嘗試離開 – leeor

另外，代替使用'raw_input' 'input' – zengr

@zengr也許它是Python 3 – Darcinon

條件密碼= PASSWORD是不夠的，退出循環（如果只有給出正確的密碼，這將退出循環）。在同時添加條件（密碼！=密碼，允許> 0）

來源

2015-10-08 01:14:43 C1sc0

現在你永遠不會退出你的while循環。要突破它，請使用break關鍵字。要完全退出程序，您需要import sys和sys.exit() 我建議將這些添加到您的if ALLOWED == 0聲明中。

來源

2015-10-08 01:14:57 TheoretiCAL

您需要使用break才能退出循環，或者添加輔助條件，否則無論如何它都會繼續運行，直到密碼正確。

所以，要麼：

while (password != PASSWORD) and (ALLOWED > 0):

或者：

if ALLOWED == 0: 
       print("You have been locked out") 
       break

來源

2015-10-08 01:15:27 Llamageddon

'break out或添加測試仍然會顯示「您已登錄」，因爲循環後面的下一行顯示「您已成功登錄系統「'。您需要退出該功能，而不僅僅是循環。 – ShadowRanger

啊，那是真的。除了解決眼前的問題之外，我並沒有真正關注這些問題。我的錯。 – Llamageddon

變化print("You have been locked out")到sys.exit("You have been locked out")（或以其他方式退出main）。請記住import sys使用sys.exit。

來源

2015-10-08 01:15:58 ShadowRanger

您的while循環需要輸入正確的密碼才能完成，並且沒有其他方式可以退出循環。我建議一個突破聲明：

def main(): 
    PASSWORD = "apple" 
    ALLOWED = 3 

    password = input("Enter the password: ") 
    while password != PASSWORD : 
     ALLOWED = ALLOWED - 1 
     print("Wrong. You have", ALLOWED, "guesses left") 

     if ALLOWED == 0: 
      print("You have been locked out") 
      break 
     password = input("Enter again ") 

    print("You have successfully logged into the system")

如果您的程序需要安全，您可能需要做更多的研究。

來源

2015-10-08 01:23:15 Darcinon

管理使其工作，但只是讓它檢查，如果允許== 0，如果它打印「你被鎖定」，如果允許< = 0，那麼它不會讓你走得更遠。

def main(): 
    PASSWORD = "apple" 
    ALLOWED = 3 

    password = input("Enter the password: ") 
    while password != PASSWORD or ALLOWED <= 0: 
     ALLOWED = ALLOWED - 1 
     if ALLOWED > 0: print("Wrong. You have", ALLOWED, "guesses left") 
     if ALLOWED == 0: print("You have been locked out") 
     if ALLOWED < 0: 
        print("You have been locked out") 
     password = input("Enter again ")    


    print("You have successfully logged into the system") 



main()

也寫這在我看來

def main(): 

    USERNAME = "admin" 
    PASSWORD = "root" 
    ATTEMPTS = 3 
    while ATTEMPTS >= 1: 
     print("You have",ATTEMPTS,"attempts left") 
     if ATTEMPTS == 0: 
      break 
     user = input("Please enter your username:") 
     password = input("Now enter your password:") 
     if user == USERNAME and password == PASSWORD: 
      print("\nYou have successfully logged into the system") 
      return 
     else: 
      print("\nThis user name or password does not exist\n") 
      ATTEMPTS -= 1 
    print("you have been locked out.") 

main()

來源

2015-10-08 01:32:37

我如何修復我的while循環

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