Python解释器等待子进程死亡

check.py

from multiprocessing import Process
import time
import sys

def slp():
 time.sleep(30)
 f=open(\"yeah.txt\",\"w\")
 f.close()

if __name__==\"__main__\" :
 x=Process(target=slp)
 x.start()
 sys.exit()

cmd

python check.py