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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Optimise `inspect.getattr_static`","articleBody":"# Feature or enhancement\r\n\r\nFollowing 6d59c9e, `typing._ProtocolMeta.__instancecheck__` uses `inspect.getattr_static` in a tight loop, where it had previously used `hasattr`. This improves semantics in several highly desirable ways, but causes a considerable slowdown for `_ProtocolMeta.__instancecheck__`, as `inspect.getattr_static` is _much_ slower than `hasattr`.\r\n\r\nThe performance hit to `_ProtocolMeta.__instancecheck__` has already been mostly mitigated through several `typing`-specific optimisations that are tracked in this issue:\r\n\r\n- https://github.com/python/cpython/issues/74690\r\n\r\nHowever, it would be good to also see if we can improve the performance of `inspect.getattr_static`. This will not only improve the performance of `isinstance()` checks against classes subclassing `typing.Protocol`. It will also improve the performance of all other tools that use `inspect.getattr_static` for introspection without side effects.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-103195\n* gh-103318\n* gh-103321\n* gh-103349\n* gh-104267\n* gh-104286\n* gh-104290\n* gh-104320\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/AlexWaygood","@type":"Person","name":"AlexWaygood"},"datePublished":"2023-04-02T16:32:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/103193/cpython/issues/103193"}