为什么在cmd中执行的结果与在IDLE中执行的结果布一样呢？求解

from multiprocessing import Process
import os

def run_proc(name):
    print 'Run child process %s (%s)...' %(name,os.getpid())

if __name__ =='__main__':
    print 'Parent process %s.' %os.getpid()
    p=Process(target=run_proc, args=('test',))
    print 'Child process will start.'
    p.start()
    p.join()
    print 'child process end.'