From 823328c8ab19cb6b781921049abcd1cb706d1a36 Mon Sep 17 00:00:00 2001 From: Josh Cannon Date: Tue, 21 May 2024 14:37:32 -0500 Subject: [PATCH] gh-90562: Mention slots pitfall in dataclass docs (GH-107391) (cherry picked from commit e3ed574f6acddf76e96a9b0fcbad35f15508cba1) Co-authored-by: Josh Cannon Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com> Co-authored-by: Jelle Zijlstra Co-authored-by: Erlend E. Aasland Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com> --- Doc/library/dataclasses.rst | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/Doc/library/dataclasses.rst b/Doc/library/dataclasses.rst index 71fbd1996e7381..455019d2206f95 100644 --- a/Doc/library/dataclasses.rst +++ b/Doc/library/dataclasses.rst @@ -185,7 +185,10 @@ Module contents - *slots*: If true (the default is ``False``), :attr:`~object.__slots__` attribute will be generated and new class will be returned instead of the original one. If :attr:`!__slots__` is already defined in the class, then :exc:`TypeError` - is raised. + is raised. Calling no-arg :func:`super` in dataclasses using ``slots=True`` will result in + the following exception being raised: + ``TypeError: super(type, obj): obj must be an instance or subtype of type``. + The two-arg :func:`super` is a valid workaround. See :gh:`90562` for full details. .. versionadded:: 3.10 pFad - Phonifier reborn

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