学习廖雪峰的python教程-多进程一章时，在PyCharm中执行进程间通信的示例代码，结果无法得到正确的结果。代码如下：
# 进程间通信
# 写数据进程执行的代码:
def write(q):
print('Process to write: %s' % os.getpid())
for value in ['A', 'B', 'C']:
print('Put %s to queue...' % value)
q.put(value)
time.sleep(random.random())
# 读数据进程执行的代码:
def read(q):
print('Process to read: %s' % os.getpid())
while True:
value = q.get(True)
print('Get %s from queue.' % value)
if __name__=='__main__':
# 父进程创建Queue，并传给各个子进程：
q = Queue()
pw = Process(target=write, args=(q,))
pr = Process(target=read, args=(q,))
# 启动子进程pw，写入:
pw.start()
# 启动子进程pr，读取:
pr.start()
# 等待pw结束:
pw.join()
# pr进程里是死循环，无法等待其结束，只能强行终止:
pr.terminate()
我的PyCharm中执行结果如下：
G:\PycharmProjects\practice\venv\Scripts\python.exe G:/PycharmProjects/practice/process_and_thread.py
Process to write: 9048
Put A to queue...
Process Process-1:
Traceback (most recent call last):
File "C:\Users\Xujian\AppData\Local\Programs\Python\Python37\lib\multiprocessing\process.py", line 297, in _bootstrap
self.run()
File "C:\Users\Xujian\AppData\Local\Programs\Python\Python37\lib\multiprocessing\process.py", line 99, in run
self._target(*self._args, **self._kwargs)
File "G:\PycharmProjects\practice\process_and_thread.py", line 77, in write
q.put(value)
File "C:\Users\Xujian\AppData\Local\Programs\Python\Python37\lib\multiprocessing\queues.py", line 82, in put
if not self._sem.acquire(block, timeout):
PermissionError: [WinError 5] 拒绝访问。
Process finished with exit code 0
而直接在cmd中，使用python命令执行该py文件可以得到正确的结果。
求助问题在哪？
已经尝试重新安装、以管理员运行PyCharm,都无法解决
