Python 倒计时秒数：获取倒计时

Question

我在做一个小游戏。当玩家给出快速答案时，我想给他们积分。 所以，我做了10秒的倒计时。 但是当我尝试确定剩余秒数时，出现错误。

代码：

#variable: 10 seconds
Countdown = 10

#function to count down seconds
def Timer(Countdown):
    while Countdown:
        time.sleep(1)
        Countdown -= 1

#variable to see how many seconds remain (this is inside another function, when the player hits the button)
Time = Countdown

我收到错误：UnboundLocalError: cannot access variable 'Countdown' where it is not associated with a value.