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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Specialized `match_keys` for exact dictionary type","articleBody":"**Feature or enhancement**\r\n\r\nI think it's probably worthwhile to write a specialized version of `match_keys` (for structural pattern matching of mappings) for exact dictionary types\r\n\r\n**Pitch**\r\n\r\nThe most common mapping type is almost certainly the built-in `dict`. The `match_keys` function in ceval.c could be specialized to handle this type. Doing so would allow you to skip the dummy `object`, and replace the `get` call with `PyDict_GetItemWithError`. I don't think this should change the observable behaviour at all for exact `dict`\r\n\r\nI'm in the process of reimplementing structural pattern matching on Cython, and this change gives ~2x optimization of some microbenchmarks.\r\n\r\nIf this change is deemed desirable I'm happy to implement it myself.\r\n\r\n**Previous discussion**\r\n\r\nNot aware of any\r\n\r\n\u003c!--\r\n  New features to Python should first be discussed elsewhere before creating issues on GitHub,\r\n  for example in the \"ideas\" category (https://discuss.python.org/c/ideas/6) of discuss.python.org,\r\n  or the python-ideas mailing list (https://mail.python.org/mailman3/lists/python-ideas.python.org/).\r\n  Use this space to post links to the places where you have already discussed this feature proposal:\r\n--\u003e\r\n\r\n\r\n\u003c!--\r\nYou can freely edit this text. Remove any lines you believe are unnecessary.\r\n--\u003e\r\n","author":{"url":"https://github.com/da-woods","@type":"Person","name":"da-woods"},"datePublished":"2022-06-11T09:23:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/93714/cpython/issues/93714"}