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[3.12] gh-90562: Mention slots pitfall in dataclass docs (GH-107391) #119351

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May 23, 2024
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[3.12] gh-90562: Mention slots pitfall in dataclass docs (GH-107391) #119351

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5 changes: 4 additions & 1 deletion Doc/library/dataclasses.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -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

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