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gh-148947: dataclasses: fix error on empty __class__ cell - #148948
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Also add a test demonstrating the need for the existing "is oldcls" check.
johnslavik
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Apr 24, 2026
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Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com>
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Thanks @JelleZijlstra for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14. |
GH-148995 is a backport of this pull request to the 3.14 branch. |
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…on#148948) Also add a test demonstrating the need for the existing "is oldcls" check. Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com>
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…148948) (#148995) gh-148947: dataclasses: fix error on empty __class__ cell (GH-148948) Also add a test demonstrating the need for the existing "is oldcls" check. (cherry picked from commit 6d7bbee) Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com> Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com>
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pythonGH-148948) pythongh-148947: dataclasses: fix error on empty __class__ cell (pythonGH-148948) Also add a test demonstrating the need for the existing "is oldcls" check. (cherry picked from commit 6d7bbee) Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com> Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com> Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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pythonGH-148948) pythongh-148947: dataclasses: fix error on empty __class__ cell (pythonGH-148948) Also add a test demonstrating the need for the existing "is oldcls" check. (cherry picked from commit 6d7bbee) Consolidates the news entries given pythonGH-148947 bug was never present in the 3.13 branch Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com> Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com> Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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…_delattr__ in frozen dataclasses with slots (GH-144021) (GH-148476) gh-105936: Properly update closure cells for `__setattr__` and `__delattr__` in frozen dataclasses with slots (GH-144021) (cherry picked from commit 8a398bf) The cherry-pick required additional changes beyond the original commit because 3.13 lacks the `__class__` closure cell fixup machinery that was added in 3.14 by GH-124455 (gh-90562). Specifically: - Backported `_update_func_cell_for__class__()` helper function and the closure fixup loop in `_add_slots()` from GH-124455. Without these, renaming the closure variable from `cls` to `__class__` has no effect because nothing updates the cell when the class is recreated with slots. - Changed `_add_slots()` to use `newcls` instead of reusing `cls` for the recreated class, so both old and new class references are available for the fixup loop. - Replaced `assertNotHasAttr` with `assertFalse(hasattr(...))` in tests (assertNotHasAttr was added in 3.14). - Dropped `test_original_class_is_gced` additions (that test does not exist on 3.13; it was added by GH-137047 for gh-135228 which was not backported to 3.13). gh-148947: dataclasses: fix error on empty __class__ cell (GH-148948) Also add a test demonstrating the need for the existing "is oldcls" check. (cherry picked from commit 6d7bbee) --------- Co-authored-by: Prometheus3375 <prometheus3375@gmail.com> Co-authored-by: Sviataslau <35541026+Prometheus3375@users.noreply.github.com> Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com> Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com>
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Also add a test demonstrating the need for the existing "is oldcls" check.
__class__cell #148947