python3学习笔记（三）多线程与多进程

线程thread，库threading

进程process，库Process

使用起来方法跟其他语言相似，也不需要下载其他的库，语言自带的库里就有

1.多线程的例子

#coding=utf-8
import threading
from time import sleep, ctime

loops = [1, 2]

def loop(nloop, nsec):
    print('start loop', nloop, 'at:', ctime())
    sleep(nsec)
    print('loop', nloop, 'done at:', ctime())



def main():
    print('starting at:', ctime())
    threads = []
    nloops = range(len(loops))  # nloops=1,2

    for i in  nloops:
        t = threading.Thread(target=loop, args=(i, loops[i]))
        threads.append(t)

    for i in nloops:
        threads[i].start()

    for i in nloops:
        threads[i].join()

    print('all end', ctime())


if __name__ == '__main__':   #Make a script both importable and executable
    main()

2.多进程的例子

#coding=utf-8
from multiprocessing import  Process
import os

def info(title):
    print(title)
    print('module name:', __name__)
    if hasattr(os, 'getppid'):
        print('parent process:', os.getppid())    #父进程id
    print('process id:', os.getpid())    #进程自己的id


def f(name):
    info('function f')
    print('hello', name)

#如果本进程A创建了一个进程B 那么B是A的子进程   A是B的父进程
if __name__ == '__main__':
    info('main process')
    p = Process(target=f, args=('ks', ))
    p.start()
    p.join()