import threading,time
def run():
time.sleep(3)
print(‘哈哈哈‘)
for i in range(50):
t = threading.Thread(target=run)
t.setDaemon(True) #把子线程设置成守护线程 (主线程一死,守护线程就死)
t.start()
print(‘Done,运行完成.‘)
time.sleep(3)
原文：https://www.cnblogs.com/jiadan/p/9120859.html