我对python多处理问题感到困惑

Question

    import multiprocessing
    import time
    import os
    
    def whoami(name):
        print("I'm %s, in process %s" % (name, os.getpid()))
    
    def loopy(name):
        whoami(name)
        start = 1
        stop = 1000000
        for num in range(start, stop):
            print("\tNumber %s of %s. Honk!!!" % (num, stop))
            time.sleep(1)
    
    
    if __name__ == "__main__":
        whoami("main")
        p = multiprocessing.Process(target=loopy, args=("loopy",))
        p.start()
        time.sleep(5)
        p.terminate() 

此代码摘自Bill Lubanovic撰写的“ Introducing python” Book，第二版。根据这本书，当我运行此代码时，会发生以下结果：

                 I'm main, in process xxxx
                 I'm loopy, in process ----
                     Number 1 of 1000000. Honk!
                     Number 2 of 1000000. Honk!
                     Number 3 of 1000000. Honk!
                     Number 4 of 1000000. Honk!
                     Number 5 of 1000000. Honk!

但是，在我的情况下，仅打印“进程以退出代码0完成”。我想知道这段代码的错误之处。