线程进程的了解

线程：最小的执行单元（实例）
进程：最小的资源单元

join函数

join函数之后，让主线程等待在join中的子线程结束

import threading
import time


def game():
    print("start play game,%s" %time.ctime())
    time.sleep(3)
    print("stop play game,%s" %time.ctime())

def sleep():
    print("start play sleep,%s" %time.ctime())
    time.sleep(6)
    print("stop play sleep,%s" %time.ctime())
if __name__ == "__main__":
    t1 = threading.Thread(target=game)
    t2 = threading.Thread(target=sleep)
    t1.start()
    t2.start()
    t1.join() #等待t1执行完毕
    print("end")
'''
start play game,Fri Oct 26 08:49:46 2018
start play sleep,Fri Oct 26 08:49:46 2018
stop play game,Fri Oct 26 08:49:49 2018
end
stop play sleep,Fri Oct 26 08:49:52 2018
'''

setdaemon守护线程

必须在start之前，设置成守护线程之后，其他线程跟着守护线程一起推出。

多进程编程

import threading
import time


def game():
    print("start play game,%s" %time.ctime())
    time.sleep(3)
    print("stop play game,%s" %time.ctime())

def sleep():
    print("start play sleep,%s" %time.ctime())
    time.sleep(6)
    print("stop play sleep,%s" %time.ctime())
if __name__ == "__main__":
    t1 = threading.Thread(target=game)
    t2 = threading.Thread(target=sleep)
    # t1.setDaemon(True) #必须添加在守护进程之前，守护线程的意思是主线程结束的时候就结束
    t2.setDaemon(True) #必须添加在守护进程之前，守护线程的意思是主线程结束的时候就结束
    threads = []
    threads.append(t1)
    threads.append(t2)
    for i in threads:
        i.start()
    # for i in threads:
    #     i.join()
    print()
    print("end")
'''
start play game,Fri Oct 26 08:50:39 2018
start play sleep,Fri Oct 26 08:50:39 2018

end
stop play game,Fri Oct 26 08:50:42 2018
'''