python - 未使用变量

Question

这将是我在这里的第一个问题，所以如果我做错了什么，请不要生气。我得到了猜测密码的作业，我不得不在其中实现 Tkinter。问题是计数器不工作，因为变量计数器没有被使用。我明白了，但我很难按应有的方式对其进行编码，但它看起来不像。对于另一个问题，下面是我再次使用 IF 的 else 语句，这样可以吗，还是您练习不同的代码。

    import Tkinter
    import random
    import tkMessageBox

    secret_number = random.randint(1, 10)

    window = Tkinter.Tk()

    greeting = Tkinter.Label(window, text="Welcome to the game " + "guess the secret number".upper() + ". You have 5 tries.\n Select a number between 1 and 10:")
    greeting.pack()


    guess = Tkinter.Entry(window)
    guess.pack()


    def check_guess():
        counter = 0
        if int(guess.get()) == secret_number:
            counter = counter + 1 #here it states "variable not used"
            result_text = "You guessed correctly! Secret number is %s! " % secret_number
        elif int(guess.get()) > secret_number:
            counter = counter + 1
            result_text = "Wrong. Your number is to HIGH! This was your %s try." % counter
        else:
            counter = counter + 1
            result_text = "Wrong. Your number is to LOW! This was your %s try." % counter
        if counter == 5 and guess != secret_number:
            print "Secret number was %s!" % secret_number

        tkMessageBox.showinfo("Result", result_text)


    submit = Tkinter.Button(window, text="Try your luck", command=check_guess)  # check_guess, not check_guess()
    submit.pack()

    window.mainloop()

Answer 1

每次调用该函数时，counter 都将设置为 0，这意味着它永远不会等于 5。一个简单的解决方法是改用全局变量。改为在函数外设置 counter = 0，并从函数中删除该行。相反，在函数的第一行写入 global counter。像这样:

counter = 0
def check_guess():
    global counter
    if int(guess.get()) == secret_number:
    ...