当随机数达到0时如何结束循环

Question

我不擅长python，也找不到我能理解的解决方案。 我试图让程序输出“随机定时器已经结束”一旦一个随机倒计时已经完成。你知道吗

import time
from random import randint

RandomTimer = randint(1,10) #picks random number of seconds for countdown
while RandomTimer > 0:
    time.sleep(1)
    RandomTimer - 1  #reduces random number every second until it reaches 0
print("random timer ended")

这里的代码不起作用，因为倒计时似乎永远不会结束，即使在10秒之后。我知道有些事我做错了，但我能想出来。你知道吗

Answer 1

您需要更新RandomTimer：

import time
from random import randint

RandomTimer = randint(1,10)
while RandomTimer > 0:
    time.sleep(1)
    RandomTimer -= 1
print("random timer ended")

上面的代码将行RandomTimer - 1更改为RandomTimer -= 1

Answer 2

在Python中，变量保存对对象的引用。你知道吗

要“更改”变量，可以更改引用的对象。或引用其他对象。 您没有更新变量：

"in place" update:

import time
from random import randint

RandomTimer = randint(1,10) #picks random number of seconds for countdown
while RandomTimer > 0:
    time.sleep(1)
    RandomTimer -= 1  #reduces random number every second until it reaches 0
print("random timer ended")

或创建新引用：

RandomTimer = randint(1,10) #picks random number of seconds for countdown
while RandomTimer > 0:
    time.sleep(1)
    RandomTimer = RandomTimer -1  #reduces random number every second until it reaches 0
print("random timer ended")