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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"collections.abc.ByteString is not equivalent to typing.ByteString","articleBody":"There are two related, but different strands of conversation here:\r\n- `collections.abc.ByteString` is useless and confusing: https://github.com/python/cpython/issues/91896\r\n- That `bytes` can be used as a shorthand for `typing.ByteString` and includes `memoryview` and `bytearray` https://peps.python.org/pep-0688/\r\n\r\nHowever, there is an additional issue! `collections.abc.ByteString` is not an accurate replacement for `typing.ByteString`! `collections.abc.ByteString` only registers `bytes` and `bytearray`, whereas `typing.ByteString` is documented as also representing a memoryview. This is an issue regardless of the above two related conversations.\r\n\r\nFor this issue we could:\r\n- Move the documentation of `typing.ByteString` out from under the \"Corresponding to collections in collections.abc\" section to the \"Other concrete types\" section\r\n- Remove all mention of `collections.abc.ByteString` from typing.rst\r\n- Keep the mention of `typing.ByteString` as being deprecated, but change the reason. ByteString is not a generic type and `collections.abc.ByteString` is not a semantic replacement for it as above, so the current reason is wrong on two counts\r\n- Define `typing.ByteString` in typeshed as a simple Union, and not the Sequence[int] thing it is right now. \r\n- Define `typing.ByteString` as a Union in typing.py instead of the generic alias it is now(?)\r\n\r\nHere's how this relates to the other two strands of conversation:\r\n- We should also remove the note about the bytes shorthand from the docs\r\n- We should deprecate both `typing.ByteString` and `collections.abc.ByteString`. I'm fine with going slow on the removal of `typing.ByteString`, since once it's a union in typeshed it's not causing much harm. But ideally we can remove `collections.abc.ByteString` in 3.14, since its isinstance behaviour is not what you want.\r\n\r\ncc @JelleZijlstra ","author":{"url":"https://github.com/hauntsaninja","@type":"Person","name":"hauntsaninja"},"datePublished":"2023-02-20T22:27:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/102092/cpython/issues/102092"}