python学习笔记之多进程

from random import randint

from time import time, sleep

def download_task(filename):

print('开始下载%s...' % filename)

time_to_download = randint(5, 10)

sleep(time_to_download)

print('%s下载完成! 耗费了%d秒' % (filename, time_to_download))

def main():

start = time()

download_task('MySQL从删库到跑路.pdf')

download_task('万万没想到.mp4')

end = time()

print('总共耗费了%.2f秒.' % (end - start))if __name__ == '__main__':

main()

from multiprocessing import Process

from os import getpid

from random import randint

from time import time, sleep

def download_task(filename):

print('启动下载进程，进程号[%d].' % getpid()) print('开始下载%s...' % filename) time_to_download = randint(5, 10)

sleep(time_to_download)

print('%s下载完成! 耗费了%d秒' % (filename, time_to_download))

def main():

start = time()

p1 = Process(target=download_task, args=('MySQL从删库到跑路.pdf', ))

p1.start()

p2 = Process(target=download_task, args=('万万没想到.mp4', ))

p2.start()

p1.join()

p2.join()

end = time()

print('总共耗费了%.2f秒.' % (end - start))

if __name__ == '__main__': main()