René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"TaskGroup suppresses grouped exceptions due to parent task cancellation ","articleBody":"TaskGroup suppresses grouped exceptions due to parent task cancellation\r\n\r\nThe suggestion was to always check for Cancellation in every finally block in async context managers, however sometimes there's no finally block visible and the problem applies to synchronous context managers too\r\n\r\nIn this demo I'd expect to be able to print: \"handled attribute error\"\r\n\r\n```python\r\nimport asyncio\r\nimport contextlib\r\n\r\nasync def child(sock):\r\n    try:\r\n        with contextlib.closing(sock):\r\n            await asyncio.sleep(2)\r\n    except Exception as e:\r\n        print(f\"child task got error: {type(e)=} {e=}\")\r\n        raise\r\n\r\nclass Sock:\r\n    async def aclose(self):\r\n        await asyncio.sleep(1)\r\n\r\nasync def main():\r\n    try:\r\n        sock = Sock()\r\n        async with asyncio.timeout(1):\r\n            async with asyncio.TaskGroup() as tg:\r\n                # Make two concurrent calls to child()\r\n                tg.create_task(child(Sock()))\r\n                tg.create_task(child(Sock()))\r\n                async with contextlib.aclosing(sock):\r\n                    await asyncio.sleep(2)\r\n    except* AttributeError:\r\n        print(\"handled attribute error\")\r\n\r\n\r\nasyncio.run(main())\r\n```","author":{"url":"https://github.com/graingert","@type":"Person","name":"graingert"},"datePublished":"2022-08-05T08:31:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/95704/cpython/issues/95704"}