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Code Issues Projects Releases Packages Wiki Activity Actions 14

gh-90562: Mention slots pitfall in dataclass docs (#107391)

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Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Erlend E. Aasland <erlend@python.org>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
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Josh Cannon 2024-05-21 14:37:32 -05:00 • committed by GitHub
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Doc/library/dataclasses.rst
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@ -185,7 +185,10 @@ Module contents
- *slots*: If true (the default is ``False``), :attr:`~object.__slots__` attribute - *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. 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` 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 .. versionadded:: 3.10