Python中進程間通信出現（PermissionError: [WinError 5] 拒絕訪問。）

from multiprocessing import Process,Queue
import os,time
def write(q):
    print("啟動寫子進程%s" % (os.getpid()))
    for chr in ["A","B","C","D"]:
        q.put(chr)
        time.sleep(1)
    print("結束寫子進程%s" % (os.getpid()))

def read(q):
    print("啟動讀子進程%s" % (os.getpid()))
    while True:
        value=q.get(True)
        print("value="+value)
    print("結束讀子進程%s" % (os.getpid()))

if __name__=="__main__":
    q=Queue()
    pw = Process(target=write,args=(q,))
    pr = Process(target=read, args=(q,))

    pw.start()
    pr.start()
    pw.join()
    #pr進程是死循環，強行結束
    pr.terminate()
    print("結束父進程")

程序出現這問題，各種嘗試還沒解決
PermissionError: [WinError 5] 拒絕訪問。