From ae3f347dc08af1125e33b122ae663fa538bbf016 Mon Sep 17 00:00:00 2001 From: "Miss Islington (bot)" <31488909+miss-islington@users.noreply.github.com> Date: Tue, 3 Dec 2024 17:17:25 +0100 Subject: [PATCH] [3.13] gh-123935: Fix typo in `_get_slots` in `dataclasses.py` (GH-123941) (#123991) gh-123935: Fix typo in `_get_slots` in `dataclasses.py` (GH-123941) (cherry picked from commit ac918ccad707ab2d7dbb78a4796a7b8a874f334c) Co-authored-by: sobolevn --- Lib/dataclasses.py | 2 +- Lib/test/test_dataclasses/__init__.py | 19 +++++++++++++++++++ ...-09-11-13-33-19.gh-issue-123935.fRZ_56.rst | 2 ++ 3 files changed, 22 insertions(+), 1 deletion(-) create mode 100644 Misc/NEWS.d/next/Library/2024-09-11-13-33-19.gh-issue-123935.fRZ_56.rst diff --git a/Lib/dataclasses.py b/Lib/dataclasses.py index 74011b7e28b9..7883ce78e57d 100644 --- a/Lib/dataclasses.py +++ b/Lib/dataclasses.py @@ -1206,7 +1206,7 @@ def _get_slots(cls): slots = [] if getattr(cls, '__weakrefoffset__', -1) != 0: slots.append('__weakref__') - if getattr(cls, '__dictrefoffset__', -1) != 0: + if getattr(cls, '__dictoffset__', -1) != 0: slots.append('__dict__') yield from slots case str(slot): diff --git a/Lib/test/test_dataclasses/__init__.py b/Lib/test/test_dataclasses/__init__.py index 54e481132373..876dbc773285 100644 --- a/Lib/test/test_dataclasses/__init__.py +++ b/Lib/test/test_dataclasses/__init__.py @@ -3707,6 +3707,25 @@ class TestSlots(unittest.TestCase): self.assertEqual(A().__dict__, {}) A() + @support.cpython_only + def test_dataclass_slot_dict_ctype(self): + # https://github.com/python/cpython/issues/123935 + from test.support import import_helper + # Skips test if `_testcapi` is not present: + _testcapi = import_helper.import_module('_testcapi') + + @dataclass(slots=True) + class HasDictOffset(_testcapi.HeapCTypeWithDict): + __dict__: dict = {} + self.assertNotEqual(_testcapi.HeapCTypeWithDict.__dictoffset__, 0) + self.assertEqual(HasDictOffset.__slots__, ()) + + @dataclass(slots=True) + class DoesNotHaveDictOffset(_testcapi.HeapCTypeWithWeakref): + __dict__: dict = {} + self.assertEqual(_testcapi.HeapCTypeWithWeakref.__dictoffset__, 0) + self.assertEqual(DoesNotHaveDictOffset.__slots__, ('__dict__',)) + @support.cpython_only def test_slots_with_wrong_init_subclass(self): # TODO: This test is for a kinda-buggy behavior. diff --git a/Misc/NEWS.d/next/Library/2024-09-11-13-33-19.gh-issue-123935.fRZ_56.rst b/Misc/NEWS.d/next/Library/2024-09-11-13-33-19.gh-issue-123935.fRZ_56.rst new file mode 100644 index 000000000000..de720c3714c6 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2024-09-11-13-33-19.gh-issue-123935.fRZ_56.rst @@ -0,0 +1,2 @@ +Fix parent slots detection for dataclasses that inherit from classes with +``__dictoffset__``. -- 2.47.3