Python 线程池用法简单示例

# -*- coding:utf-8 -*-
#! python3
'''
Created on 2019-10-2
@author: Administrator
'''
from concurrent.futures import ThreadPoolExecutor,ProcessPoolExecutor
import os,time,random
def task(n):
  print('%s is runing' %os.getpid())
  time.sleep(random.randint(1,3))
  return n**2
if __name__ == '__main__':
  executor=ProcessPoolExecutor(max_workers=3)
  futures=[]
  for i in range(11):
    future=executor.submit(task,i)
    futures.append(future)
  executor.shutdown(True)
  print('+++>')
  for future in futures:
    print(future.result())