René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"RuntimeError: can't register atexit after shutdown","articleBody":"When running a simple vpython script, as I move the mouse across the screen I get a continual stream of these errors:\r\n```\r\nTask exception was never retrieved\r\nfuture: \u003cTask finished name='Task-2435' coro=\u003cWSserver.onMessage() done, defined at C:\\Users\\kg604c\\AppData\\Roaming\\Python\\Python310\\site-packages\\vpython\\no_notebook.py:181\u003e exception=RuntimeError(\"can't register atexit after shutdown\")\u003e\r\nTraceback (most recent call last):\r\n  File \"C:\\Users\\kg604c\\AppData\\Roaming\\Python\\Python310\\site-packages\\vpython\\no_notebook.py\", line 214, in onMessage\r\n    await loop.run_in_executor(None, GW.handle_msg, msg)\r\n  File \"C:\\Program Files\\Python310\\lib\\asyncio\\base_events.py\", line 808, in run_in_executor\r\n    executor = concurrent.futures.ThreadPoolExecutor(\r\n  File \"C:\\Program Files\\Python310\\lib\\concurrent\\futures\\__init__.py\", line 49, in __getattr__\r\n    from .thread import ThreadPoolExecutor as te\r\n  File \"C:\\Program Files\\Python310\\lib\\concurrent\\futures\\thread.py\", line 37, in \u003cmodule\u003e\r\n    threading._register_atexit(_python_exit)\r\n  File \"C:\\Program Files\\Python310\\lib\\threading.py\", line 1484, in _register_atexit\r\n    raise RuntimeError(\"can't register atexit after shutdown\")\r\nRuntimeError: can't register atexit after shutdown\r\n```\r\n\r\nThis seems to be the same issue as mentioned in #133 however that was a few years ago.  I'm unable to downgrade to an older version of python though, is it still something that hasn't been fixed?\r\n\r\nI'm running Python 3.10.0 and VPython 7.6.3","author":{"url":"https://github.com/jaguar36","@type":"Person","name":"jaguar36"},"datePublished":"2022-05-04T18:14:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/204/vpython-jupyter/issues/204"}