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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Subclasses of `ExceptionGroup` can wrap `BaseException`s","articleBody":"```python\r\nclass MyEG(ExceptionGroup):\r\n    \"\"\"Holds BaseExceptions without itself being a BaseException.\"\"\"\r\n\r\noops = MyEG(\"oops\", [KeyboardInterrupt()])\r\nassert isinstance(oops, Exception)\r\nassert not isinstance(oops.exceptions[0], Exception)\r\n```\r\n\r\nI believe that this is a bug tracing to the period when PEP-654 did not intend `(Base)ExceptionGroup` to be usable as a parent class; and I think a sufficient fix would be to replace the type-equality check with an isinstance check in:\r\n\r\nhttps://github.com/python/cpython/blob/bc390dd93574c3c6773958c6a7e68adc83d0bf3f/Objects/exceptions.c#L740-L744\r\n\r\ncc @iritkatriel; raised via https://github.com/agronholm/exceptiongroup/pull/40#discussion_r1020961107\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-99572\n* gh-99580\n* gh-99615\n* gh-103435\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/Zac-HD","@type":"Person","name":"Zac-HD"},"datePublished":"2022-11-17T00:09:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/99553/cpython/issues/99553"}