Python中进程间通信出现（PermissionError: [WinError 5] 拒绝访问。）

from multiprocessing import Process,Queue
import os,time
def write(q):
    print("启动写子进程%s" % (os.getpid()))
    for chr in ["A","B","C","D"]:
        q.put(chr)
        time.sleep(1)
    print("结束写子进程%s" % (os.getpid()))

def read(q):
    print("启动读子进程%s" % (os.getpid()))
    while True:
        value=q.get(True)
        print("value="+value)
    print("结束读子进程%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进程是死循环，强行结束
    pr.terminate()
    print("结束父进程")

程序出现这问题，各种尝试还没解决
PermissionError: [WinError 5] 拒绝访问。