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gh-138991: Update dataclass documentation for new eq behavior in Python 3.13 and add tests #139007

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Merged
vstinner merged 11 commits into from
Jun 11, 2026
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gh-138991: Update dataclass documentation for new eq behavior in Python 3.13 and add tests #139007

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1b4a856
Add a note to the platform.machine() documentation section
Aniketsy Sep 16, 2025
08b07a2
Add a note to the platform.machine() documentation section
Aniketsy Sep 16, 2025
3692677
Update dataclass documentation for new __eq__ behavior in 3.13 and ad…
Aniketsy Sep 16, 2025
262f785
Update dataclass documentation for new __eq__ behavior in 3.13 and ad…
Aniketsy Sep 16, 2025
ada26a9
Update dataclass documentation for new __eq__ behavior in 3.13 and ad…
Aniketsy Sep 17, 2025
5712279
Update dataclass documentation for new __eq__ behavior in 3.13 and ad…
Aniketsy Sep 17, 2025
822bbaa
Update dataclass documentation for new __eq__ behavior in 3.13 and ad…
Aniketsy Sep 18, 2025
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add note
Aniketsy Nov 8, 2025
7b092a6
Merge branch 'main' into dataclass-eq-doc-update-3-13
Aniketsy Nov 8, 2025
1d02dd7
move versionchanged block after 'ignored' sentence
Aniketsy Jun 11, 2026
4991c6a
Merge branch 'main' into dataclass-eq-doc-update-3-13
vstinner Jun 11, 2026
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move versionchanged block after 'ignored' sentence
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@Aniketsy
Aniketsy committed Jun 11, 2026
commit 1d02dd7713679436a5812261504a2e887b2902fd
16 changes: 8 additions & 8 deletions Doc/library/dataclasses.rst
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Expand Up @@ -108,20 +108,20 @@ Module contents
This method compares the class by comparing each field in order. Both
instances in the comparison must be of the identical type.

If the class already defines :meth:`!__eq__`, this parameter is ignored.

.. versionchanged:: 3.13
The generated ``__eq__`` method now compares each field individually
(for example, ``self.a == other.a and self.b == other.b``), rather than
comparing tuples of fields as in previous versions.

This change makes the comparison faster but it may alter results in cases
where attributes compare equal by identity but not by value (such as
``float('nan')``).
This change makes the comparison faster but it may alter results in cases
where attributes compare equal by identity but not by value (such as
``float('nan')``).

In Python 3.12 and earlier, the comparison was performed by creating
tuples of the fields and comparing them (for example,
``(self.a, self.b) == (other.a, other.b)``).

If the class already defines :meth:`!__eq__`, this parameter is ignored.
In Python 3.12 and earlier, the comparison was performed by creating
tuples of the fields and comparing them (for example,
``(self.a, self.b) == (other.a, other.b)``).

- *order*: If true (the default is ``False``), :meth:`~object.__lt__`,
:meth:`~object.__le__`, :meth:`~object.__gt__`, and :meth:`~object.__ge__` methods will be
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