[Python] Multiprocessing spawn_main throwing OSError: [WinError 87] The parameter is incorrect

I am learning distributed process on an python tutorial website : https://www.liaoxuefeng.com/wiki/00...29340191970154d52b9d484b88a7b343708fcc60000#0

Here is the turorial code that run as a main process.

task_master.py


import random, time, queue
from multiprocessing.managers import BaseManager


task_queue = queue.Queue()
result_queue = queue.Queue()

class QueueManager(BaseManager):
pass

QueueManager.register('get_task_queue', callable=lambda:task_queue)
QueueManager.register('get_result_queue', callable=lambda:result_queue)
manager = QueueManager(address=('',5000), authkey=b'abc')
manager.start()
task = manager.get_task_queue()
result = manager.get_result_queue()
for i in range(10):
n = random.randint(0,10000)
print('Put task %d...' %n)
task.put(n)
print('Try get result...')
for i in range(10):
r = result.get(timeout = 10)
print('Result:%s'%r)
manager.shutdown()
print('master exit.')


The code is not completed, for it raises some errors that I have no idea how to deal with when I tied to run it on my computer.

error


D:\py>Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\Raven\AppData\Local\Programs\Python\Python36\lib\multiprocessing\spawn.py", line 99, in spawn_main
new_handle = reduction.steal_handle(parent_pid, pipe_handle)
File "C:\Users\Raven\AppData\Local\Programs\Python\Python36\lib\multiprocessing\reduction.py", line 82, in steal_handle
_winapi.PROCESS_DUP_HANDLE, False, source_pid)
OSError: [WinError 87] The parameter is incorrect。

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