python_多进程

 1 import multiprocessing,time,virtualenv
 2 def down_load():
 3     time.sleep(5)
 4     print(‘运行完了‘)
 5 
 6 if __name__ == ‘__main__‘:
 7     for i in range(5):
 8         p = multiprocessing.Process(target=down_load)
 9         p.start()
10     while len(multiprocessing.active_children()) !=0:  #等待子进程结束
11         pass
12 
13     print(multiprocessing.current_process())
14     print(‘end‘)