Python多进程

import os
import time
pid = os.fork()

if pid == 0:
    print(‘子进程:{}父进程{}‘.format(os.getpgid(),os.getppid()))
else:
    print(‘我是父进程{}‘.format(pid))
time.sleep(2)

import time
from concurrent.futures import ProcessPoolExecutor
import multiprocessing
def get_html(n):
    time.sleep(n)
    print(n)
    print(33)
    return n
if __name__==‘__main__‘:
 
    pro = multiprocessing.Process(target=get_html, args=(2,))
    pro.start()
    pro.join()

import time
from concurrent.futures import ProcessPoolExecutor
import multiprocessing
def get_html(n):
    print(‘逆火‘)
    time.sleep(n)
    print(n)

    return n
if __name__==‘__main__‘:
    print("合数{}".format(multiprocessing.cpu_count()))
    Pool = multiprocessing.Pool(multiprocessing.cpu_count())
    # result = Pool.apply_async(get_html, args=(3,))
    # #等待所有任务完成
    # Pool.close()
    # Pool.join()
    # print(result.get())

    for ret in Pool.imap(get_html, [1,5,3]):
        print(‘返回值{}‘.format(ret))