【Rollo的Python之路】多线程实例

多线程实例：

共节省两秒时间，以最大的时间为准，小的时间就是省下来的时间。

IO密集型项目，多线程可以节省时间，像爬虫这样的项目

计算密集型项目，就是用C来代替python写。

或者可以是协和+多进程。

import threading
import time
from time import ctime,sleep

def music(func):
    for i in range(2):
        print("I was listening to %s.%s" %(func,ctime()))
        sleep(1)
        print("end listening %s" % ctime())

def movie(func):
    for i in range(2):
        print("I was at the %s %s" %(func,ctime()))
        sleep(5)
        print("end watch %s" % ctime())

threads = []

t1 = threading.Thread(target=music,args=("overstock",))
threads.append(t1)
t2 = threading.Thread(target=movie,args=("kill them all",))
threads.append(t2)

if __name__ =="__main__":
    for t in threads:
        t.start()
        print("all over %s" %ctime())


执行结果：


I was at the kill them all Thu May 23 21:26:14 2019
all over Thu May 23 21:26:14 2019
end listening Thu May 23 21:26:15 2019
I was listening to overstock.Thu May 23 21:26:15 2019
end listening Thu May 23 21:26:16 2019
end watch Thu May 23 21:26:19 2019
I was at the kill them all Thu May 23 21:26:19 2019
end watch Thu May 23 21:26:24 2019

单线程实例：

import time
from time import ctime,sleep


def music(func):
    for i in range(2):
        print("I was listening to %s.%s" %(func,ctime()))
        sleep(1)

def movie(func):
    for i in range(2):
        print("I was at the %s %s" %(func,ctime()))
        sleep(5)


if __name__ =="__main__":
    music(u'七里香')
    movie(u'kill them all')

执行结果：
#注意时间间隔

I was listening to 七里香.Thu May 23 21:31:12 2019
I was listening to 七里香.Thu May 23 21:31:13 2019
I was at the kill them all Thu May 23 21:31:14 2019
I was at the kill them all Thu May 23 21:31:19 2019