1 from multiprocessing import Pool
 2 from time import sleep
 3 def Foo(i):
 4     sleep(1)
 5     print(i)
 6 
 7 
 8 if __name__ == "__main__":
 9     #5个线程会同时执行
10     pool = Pool(5)
11 
12     for i in range(50):
13         #从进程池中申请进程，还可以传入callback参数作为进程结束后的回调函数
14         pool.apply_async(func=Foo, args=(i,))
15     pool.close()
16     pool.join()