多进程

import multiprocessing,timedef down_load():   time.sleep(5)   print("运行完了")if __name__ == '__main__':   for i in range(5):      p = multiprocessing.Process(target=down_load)      p.start()   while len(multiprocessing.active_children())!=0:#等待子进程结束      pass   # print(multiprocessing.active_children())   print(multiprocessing.current_process())   print('end')

来源：https://www.cnblogs.com/lapt/p/11893332.html