python 3.2全局变量在线程中时不更新 [英] python 3.2 global variable not updating when its in a thread

问题描述

我正在编写程序，但遇到了问题. 我正在运行一个线程，该线程具有while循环，该循环检查全局变量是否等于False，如果其等于True，则退出while循环. 问题是，即使我将全局变量更新为True，它仍然不会停止，只会继续运行.

I'm making a program and I got into a problem. I have a thread running which has a while loop that checks if a global variable is equal to False, if its equal to True then exit the while loop. The problem is even if i update the global variable to True it still doesn't stop, it just continues on.

代码:

循环时

while stopIt==False:
    print(stopIt) # Always prints out False, even when exit() is called
    # do things...

停止器:

def exit():
    stopIt = True

stopIt变量定义:

stopIt variable defenition:

global stopIt
stopIt = False

推荐答案

global声明必须位于修改全局变量的函数中:

The global declaration must be inside the function where you modify the global variable:

def exit():
    global stopIt
    stopIt = True

这篇关于python 3.2全局变量在线程中时不更新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！