进程线程池

 事实上，多进程、多线程、进程线程池、协程都可以实现并发

from concurrent.futures import ProcessPoolExecutor,ThreadPoolExecutor
from threading import currentThread
import os,time,random

def task(name):
    # print('name:%s pid:%s run'%(name,os.getpid()))
    print('name:%s pid:%s run' % (currentThread().getName(), os.getpid()))
    time.sleep(random.randint(1,3))

if __name__ == '__main__':
    # pool = ProcessPoolExecutor(4)  # 但只有4个进程执行，同一时间只有4个任务在执行，走一个任务，空下来的进程可以执行其他任务
    pool = ThreadPoolExecutor(5)
    for i in range(10):
        pool.submit(task,'egon%s'%i)  # 会把10个任务全扔到池子里，此时并未创建进程，无进程号

    pool.shutdown(wait=True)
    print('主')