python多进程（加入进程池）操作常见案例-创新互联

本文实例讲述了python多进程（加入进程池）操作。分享给大家供大家参考，具体如下：

一、多进程复制多个文件

import multiprocessing
import os
import time
# 复制文件，传入文件名
def copy_file(old_file_name, old_name):
  new_file_name = 'new_file'
  new_name = old_name
  if not os.path.exists(new_file_name):
    os.makedirs(new_file_name)
  with open(old_file_name + '/' + old_name, 'rb') as f:
    file_content = f.read()
  with open(new_file_name + '/' + new_name, 'wb') as f:
    f.write(file_content)
if __name__ == '__main__':
  old_file_name = 'old_file'
  name_list = os.listdir(old_file_name)
  time_old = time.time()
  for name in name_list:
    process = multiprocessing.Process(target=copy_file, args=(old_file_name, name))
    process.start()
  time_new = time.time()
  print('执行时间：%f' % (time_new - time_old))