单线程与多线程的应用 --Python3-优快云博客

本文通过实例对比了单线程、多线程及多进程在Python中的应用。从单线程的串行执行开始，逐步引入多线程与多进程的概念，展示了并行处理如何提高程序效率。

1、单线程应用

from time import ctime, sleep
from time import ctime, sleep


class ThreadClass:
    def say(self):
        print('Begin say：%s' % ctime())
        sleep(2)

    def write(self):
        print('Brgin write：%s' % ctime())
        sleep(2)


if __name__ == '__main__':
    t = ThreadClass()
    t.say()
    t.write()
    print('All end：%s' %ctime())

Begin say：Wed Jun 12 17:14:11 2019
Brgin write：Wed Jun 12 17:14:13 2019
All end：Wed Jun 12 17:14:15 2019

2、多线程的应用

from time import ctime, sleep
import threading


class ThreadClass:
    def say(self, content, loop):
        for i in range(loop):
            print('Say：%s,Time：%s' % (content, ctime()))
            sleep(2)

    def write(self, content, loop):
        for i in range(loop):
            print('Write：%s,Time：%s' % (content, ctime()))
            sleep(2)


if __name__ == '__main__':
    threadings = []
    tc = ThreadClass()
    t1 = threading.Thread(target=tc.say, args=('say content', 2))
    t2 = threading.Thread(target=tc.write, args=('write content', 2))
    threadings.append(t1)
    threadings.append(t2)
    for t in threadings:
        t.start()
    for t in threadings:
        t.join()
    print('All the end：%s' % ctime())

Say：say content,Time：Wed Jun 12 21:58:31 2019
Write：write content,Time：Wed Jun 12 21:58:31 2019
Write：write content,Time：Wed Jun 12 21:58:33 2019
Say：say content,Time：Wed Jun 12 21:58:33 2019
All the end：Wed Jun 12 21:58:35 2019

3、扩展：多进程的应用

from time import ctime, sleep
import multiprocessing


class ThreadClass:
    def say(self, content, loop):
        for i in range(loop):
            print('Say：%s,Time：%s' % (content, ctime()))
            sleep(2)

    def write(self, content, loop):
        for i in range(loop):
            print('Write：%s,Time：%s' % (content, ctime()))
            sleep(2)


if __name__ == '__main__':
    multiprocessings = []
    tc = ThreadClass()
    t1 = multiprocessing.Process(target=tc.say, args=('say content', 2))
    t2 = multiprocessing.Process(target=tc.write, args=('write content', 2))
    multiprocessings.append(t1)
    multiprocessings.append(t2)
    for t in multiprocessings:
        t.start()
    for t in multiprocessings:
        t.join()
    print('All the end：%s' % ctime())

Say：say content,Time：Wed Jun 12 22:03:54 2019
Write：write content,Time：Wed Jun 12 22:03:54 2019
Say：say content,Time：Wed Jun 12 22:03:56 2019
Write：write content,Time：Wed Jun 12 22:03:56 2019
All the end：Wed Jun 12 22:03:58 2019

转载于:https://www.cnblogs.com/qikeyishu/p/11013130.html