Python学习之路：守护线程

守护线程：只起到守护主线程的作用，主线程退出守护线程也跟着退出。

import threading,time

def run(n):
    print("task",n)
    time.sleep(2)
    print("task done",n)

start_time = time.time()
t_objs =  []
for i in range(50):
    t = threading.Thread(target=run,args=("t-%s"%i,))
    t.setDaemon(True)#把当前线程设置为守护线程
    t.start()
    t_objs.append(t)#为了不阻塞后面线程的启动，不在这里join,先放到一个列表里

# for t in t_objs:#循环线程实例列表，等待所有线程执行完毕
#     t.join()

print("------all threads has finished....",threading.current_thread(),)
print("cost:",time.time()-start_time)

    # t1 = threading.Thread(target=run,args=("t1",))
    # t2 = threading.Thread(target=run,args=("t2",))
    # t1.start()
    # t2.start()

# run("t1")
# run("t2")