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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"calling .register on typing.KeysView subclass causes false positive error `Member \"register\" is unknown`","articleBody":"Type checkers that include the recent changes from ~~https://github.com/python/typeshed/pull/8977~~ https://github.com/python/typeshed/pull/9058 (e.g. pyright v1.1.281) now incorrectly emit an error like `Member \"register\" is unknown` for the following line of code:\r\n\r\nhttps://github.com/jab/bidict/blob/522c9b69249d66c201fed608f95a5da8d3064ed8/bidict/_base.py#L51\r\n\r\nType checkers that do not include those changes (e.g. pyright v1.1.278) do not emit any error for that line, as expected.\r\n\r\nCopy/pasted excerpt:\r\n```python\r\nimport typing as t\r\n\r\nfrom ._typing import KT  # a typevar\r\n\r\n\r\nclass BidictKeysView(t.KeysView[KT], t.ValuesView[KT]):\r\n    \"\"\"Since the keys of a bidict are the values of its inverse (and vice versa),\r\n    the :class:`~collections.abc.ValuesView` result of calling *bi.values()*\r\n    is also a :class:`~collections.abc.KeysView` of *bi.inverse*.\r\n    \"\"\"\r\n\r\n\r\ndict_keys: t.Type[t.KeysView[t.Any]] = type({}.keys())\r\nBidictKeysView.register(dict_keys)  # \u003c-- false positive error emitted here\r\n```\r\n\r\nPlease let me know if there is any other info I can provide. Thank you!","author":{"url":"https://github.com/jab","@type":"Person","name":"jab"},"datePublished":"2022-11-29T00:44:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/9296/typeshed/issues/9296"}