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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`asyncio.Timeout.__aexit__` does not handle `BaseExceptionGroup`","articleBody":"# Bug report\n\n### Bug description:\n\nThere may be a good reason for this I am not seeing, but in the `asyncio.Timeout.__aexit__` handler, the exception group handling seems too narrow:\n\nhttps://github.com/python/cpython/blob/9743d069bd53e9d3a8f09df899ec1c906a79da24/Lib/asyncio/timeouts.py#L113-L119\n\nGiven `exc_val` itself can be a `BaseException` and `_insert_timeout_error` takes a `BaseException` as an argument, I fail to see a reason not to check for superclass `BaseExceptionGroup` instead.\n\nhttps://github.com/python/cpython/blob/9743d069bd53e9d3a8f09df899ec1c906a79da24/Lib/asyncio/timeouts.py#L133\n\nThis no longer impacts me as I implemented what I was aiming for in a better way, but it still looks like a bug. Is it?\n\n### CPython versions tested on:\n\n3.13\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-137797\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/PLPeeters","@type":"Person","name":"PLPeeters"},"datePublished":"2025-08-08T11:58:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/137549/cpython/issues/137549"}