测试代码

import threading

import time

def do_thread_test():

print 'start thread time:', time.strftime('%H:%M:%S')

time.sleep(5)

print 'stop thread time:', time.strftime('%H:%M:%S')

threads = []

for i in range(2):

thread1 = threading.Thread(target=do_thread_test)

thread1.setDaemon(True)

threads.append(thread1)

for t in threads:

t.start()

for t in threads:

t.join()

print 'stop main thread', time.strftime('%H:%M:%S')

注释掉join，注释掉setDaemon(或设置为False)，执行结果

start thread time: 21:57:40

start thread time: 21:57:40

stop main thread 21:57:40 主

stop thread time: 21:57:45

stop thread time: 21:57:45

注释掉join，设置setDaemon=True,执行结果

start thread time: 21:59:47

start thread time: 21:59:47

stop main thread 21:59:47

join方法的作用是阻塞，等待子线程结束

join无参数,注释掉setDaemon(或设置为True/False),执行结果

start thread time: 22:02:00

start thread time: 22:02:00

stop thread time: 22:02:05

stop thread time: 22:02:05

stop main thread 22:02:05 主

阻塞时间为time*thread_num

join参数为1，注释掉setDaemon(或设置为False)，执行结果

start thread time: 22:11:22

start thread time: 22:11:22

stop main thread 22:11:24

stop thread time: 22:11:27

stop thread time: 22:11:27

join参数为1，设置setDaemon=True，执行结果(阻塞time*thread_num)

start thread time: 22:12:38

start thread time: 22:12:38

stop main thread 22:12:40

原文链接:https://blog.csdn.net/weixin_44961798/article/details/108269495