怎么做域名网站备案,郑州网站建站网站,wordpress手机,易网做的网站后台守护线程 如果python线程是守护线程#xff0c;那么以为着这个线程是“不重要”的#xff0c;“不重要”意味着如果他的父进程结束了但该守护线程没有运行完#xff0c;守护进程就会被强制结束。如果线程是非守护线程#xff0c;那么父进程只有等到守护线程运行完毕后才能结…守护线程 如果python线程是守护线程那么以为着这个线程是“不重要”的“不重要”意味着如果他的父进程结束了但该守护线程没有运行完守护进程就会被强制结束。如果线程是非守护线程那么父进程只有等到守护线程运行完毕后才能结束。在python中线程通过threadName.setDaemon(True|False)来设置是否为守护线程代码实例父进程中调用两个线程但父进程会瞬间运行完观察两个线程的运行情况。 import time
import threadingdef write(content):start_time time.strftime(%Y/%m/%d-%H:%M:%S, time.localtime(time.time()))string start writting %s at %s % (content, start_time)print(string)time.sleep(5)end_time time.strftime(%Y/%m/%d-%H:%M:%S, time.localtime(time.time()))string start writting %s at %s % (content, end_time)print(string)def watch(content):start_time time.strftime(%Y/%m/%d-%H:%M:%S, time.localtime(time.time()))string start watching %s at %s % (content, start_time)print(string)time.sleep(5)end_time time.strftime(%Y/%m/%d-%H:%M:%S, time.localtime(time.time()))string start watching %s at %s % (content, end_time)print(string)threads []
t1 threading.Thread(targetwrite, args(poem,))
t2 threading.Thread(targetwatch, args(video,))
threads.append(t1)
threads.append(t2)def for_test():for thread in threads:thread.setDaemon(False)thread.start()print(main over)if __name__ __main__:for_test()运行结果 可以看到主线程瞬间结束但是等待到子线程均运行完毕之后程序才退出。 import time
import threadingdef write(content):start_time time.strftime(%Y/%m/%d-%H:%M:%S, time.localtime(time.time()))string start writting %s at %s % (content, start_time)print(string)time.sleep(5)end_time time.strftime(%Y/%m/%d-%H:%M:%S, time.localtime(time.time()))string start writting %s at %s % (content, end_time)print(string)def watch(content):start_time time.strftime(%Y/%m/%d-%H:%M:%S, time.localtime(time.time()))string start watching %s at %s % (content, start_time)print(string)time.sleep(5)end_time time.strftime(%Y/%m/%d-%H:%M:%S, time.localtime(time.time()))string start watching %s at %s % (content, end_time)print(string)threads []
t1 threading.Thread(targetwrite, args(poem,))
t2 threading.Thread(targetwatch, args(video,))
threads.append(t1)
threads.append(t2)def for_test():for thread in threads:thread.setDaemon(True)thread.start()if __name__ __main__:print(main start a t %s %(time.strftime(%Y/%m/%d-%H:%M:%S, time.localtime(time.time()))))for_test()print(main end at %s %(time.strftime(%Y/%m/%d-%H:%M:%S, time.localtime(time.time()))))运行结果 我们可以看到主线程结束之后整个程序即退出了。 更新时间 2019 11 12
