[Python] AttributeError: module 'queue' has no attribute 'SimpleQueue' [duplicate]

I follow typing the code from https://realpython.com/async-io-python/#async-ios-roots-in-generators to practice crawling with aiohttp.

Especially when I started to code section 'A Full Program: Asynchronous Requests', I encountered an error.

Here is my code.

async def fetch_html(url: str, session: ClientSession, **kwargs) -> str:
resp = await session.request(method='GET', url=url, **kwargs)
resp.raise_for_status()
html = await resp.text()
return html

async def bulk_crawl_and_write(file: IO, urls: set, **kwargs) -> None:
urls = [
'https://regex101.com/'
]
async with ClientSession() as session:
tasks = []
for url in urls:
tasks.append(fetch_html(url=url, session=session, **kwargs))
await asyncio.gather(*tasks)

if __name__ == '__main__':
asyncio.run(bulk_crawl_and_write(file=None, urls=None))



And the traceback.

Traceback (most recent call last):
File "areq2.py", line 108, in <module>
asyncio.run(bulk_crawl_and_write(file=outpath, urls=urls))
File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/runners.py", line 43, in run
return loop.run_until_complete(main)
File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/base_events.py", line 584, in run_until_complete
return future.result()
File "areq2.py", line 92, in bulk_crawl_and_write
await asyncio.gather(*tasks)
File "areq2.py", line 79, in write_one
async with aiofiles.open(file, "a") as f:
File "/Users/jun/Project/.venv_exp/lib/python3.7/site-packages/aiofiles/base.py", line 78, in __aenter__
self._obj = yield from self._coro
File "/Users/jun/Project/.venv_exp/lib/python3.7/site-packages/aiofiles/threadpool/__init__.py", line 35, in _open
f = yield from loop.run_in_executor(executor, cb)
File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/base_events.py", line 749, in run_in_executor
executor = concurrent.futures.ThreadPoolExecutor()
File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/concurrent/futures/thread.py", line 135, in __init__
self._work_queue = queue.SimpleQueue()
AttributeError: module 'queue' has no attribute 'SimpleQueue'



I copy & pasted the whole code from the provided link to check if the rest codes are essential to run normal, but it returns the same error.

I also checked my python version and it is 3.7.3

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