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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`tp_bases` of `object` is `NULL`: undocumented or unintentional behavior change in 3.12?","articleBody":"# Documentation\r\n\r\nSee https://github.com/python/cpython/pull/103912#issuecomment-1559779144 for full context.\r\n\r\nSpecific problem:\r\n\r\n**It appears `tp_bases` of `object` was an empty tuple in the past, but is now `NULL`, could that be? Is that intentional?**\r\n\r\nIf intentional, could it please be documented? I think the behavior change is likely to trip up fair a number of people.\r\n\r\nI looked in https://github.com/python/cpython/blob/edd0cb8e77d7b65f5a9c2c69dc81f9c4514878d5/Doc/whatsnew/3.12.rst but don't see `tp_bases` being mentioned there.\r\n\r\nI also verified that the `tp_bases == nullptr` patch is still needed with current 3.12 HEAD (edd0cb8e77d7b65f5a9c2c69dc81f9c4514878d5).\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-105115\n* gh-105124\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/rwgk","@type":"Person","name":"rwgk"},"datePublished":"2023-05-27T14:23:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":18},"url":"https://github.com/105020/cpython/issues/105020"}