day14中的windows环境multiprocess调用Process没有效果

from multiprocessing import Process
from os import getpid
from time import time, sleep
from random import randint

def download_task(filename):
print('启动进程,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=('Python从入门到住院.pdf',))
p1.start()
p2 = Process(target=download_task, args=('Peking Hot.avi',))
p2.start()
p1.join()
p2.join()

end = time()
print('总共耗费了%.2f秒.' % (end - start))

if name == 'main':
main()

最后的输出只有： 总共耗费了0.15秒.

Start from the multiprocessing example shown in the issue and check how it is being run on Windows, including the Process entry point and child-process output. Reproduce the reported result, then verify that both child processes print their progress and that the total time reflects concurrent five-to-ten-second tasks.