Python背景线程

Question

鉴于此代码段：

import time

if __name__ == "__main__":
    list = []
    counter = 0
    while True:
        counter = counter + 1
        time.sleep(0.0033)
        list.append(counter)

我想创建一个在后台运行的线程，在数组上执行一些元数据计算（查找数组中元素的总和）＆＃34; list＆＃34;在while循环中实时填充。

Answer 1

import time
import threading


if __name__ == "__main__":

    def print_sum(l):
        while True:
            total = sum(l)
            print("the total is {}".format(total))
            time.sleep(1)


    #list = [] - should not use 'list'. - this shadows the built in object name list.
    l = []
    counter = 0
    thread = threading.Thread(target=print_sum,args=(l,))
    thread.daemon = True
    thread.start()
    while True:
        counter = counter + 1
        l.append(counter)
        time.sleep(1)

这会在后台运行函数print_sum中旋转一个线程，以显示列表的总和。