While 循環發生的次數超出預期（Python）

Question

在if / elif語句中包含的代碼將其相關變量設置為False后，由x變量控制的while循環不會停止。 而不是停止while循環，當x變量設置為False時，它允許循環再發生一次，然后導致循環停止。 這是什么原因造成的？

def GameIntro():
# Declaration of outer while loop variable
    x = True
# Outer while loop that I want to keep running until the player enters the 'yes' branch of the if statement
    while x:
# Declaration of inner while loop variable
        j = True
        playerName = input("Please enter your name:")
        print("\nWelcome " + playerName)
        print("At any time, type 'Help' to bring up the list of possible actions." + "\n")
        while j:
            beginGame = input(playerName + ", are you ready to begin? [Y] or [N]")
            beginGame = beginGame.upper()
            if beginGame == "Y" or beginGame == "YES":
# At this point I want this function to end and for it to return a True value. The     # print is purely for testing purposes.
                print("Yes Test")
                x = False
                j = False
                return True
            elif beginGame == "N" or beginGame == "NO":
# At this point, I want the inner loop to stop and for the outer loop to occur again.  # This works.
                print("No Test")
                j = False
            else:
                print("Please enter either [Y] or [N]")

GameIntro()

這是我得到的 output。

Please enter your name:Bob 
Welcome Bob 
At any time, type 'Help' to bring up the list of possible actions. 
Bob, are you ready to begin? [Y] or [N]
Y 
Yes Test 
Please enter your name:Bob2 
Welcome Bob2 
At any time, type 'Help' to bring up the list of possible actions. 
Bob2, are you ready to begin? [Y] or [N]
Y Yes Test 
Run game 
Process finished with exit code 0

“運行游戲”來自另一個 function，它從if / elif語句的 yes 分支接收返回的True 。

Answer 1

我不認為你真的需要一個單獨的變量，你可以使用beginGame ，例如作為你的標記值

我還建議在循環中的每個點都放置一個break點，而不是依賴return ，除非您無法安全返回 state

def validInput(x):
    return x in {'YES', 'Y'}

def intro():
    playerName = input("Please enter your name:")
    print("\nWelcome " + playerName)
    print("At any time, type 'Help' to bring up the list of possible actions." + "\n")
    beginGame = 'N'
    while not validInput(beginGame):
        beginGame = input(playerName + ", are you ready to begin? [Y] or [N]").upper()
        if beginGame == "HELP":
            print('[Y] or [N]?')
        elif validInput(beginGame):
            print('Starting Game!')
    print(f'Getting {playerName} ready to play...')
    return (playerName, True)

playerName, ready_intro = intro()
if ready_intro:
    main_game(playerName)