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()