Issues

• Source and notice provenance of copied OnceLock documentation (PR #4512)

  PyO3/pyo3#6527 · Filter by author markus-li opened on Oct 14, 2026

• Undefined behavior with a pyclass w/ >16 byte alignment

  Bug

  PyO3/pyo3#6526 · Filter by author acshi opened on Oct 14, 2026
  4

• Reliable way to configure pyo3

  Feature

  PyO3/pyo3#6518 · Filter by author SWW13 opened on Oct 13, 2026
  2

• experimental-inspect: deriving IntoPyObject for a recursive enum fails with E0391

  PyO3/pyo3#6509 · Filter by author zbarsky-openai opened on Oct 11, 2026

• Simple enum with a user __repr__ gets two Py_tp_repr slots; Python 3.15 emits a DeprecationWarning

  Bug

  PyO3/pyo3#6494 · Filter by author li-em opened on Oct 9, 2026

• no_std support for thread locals and once cell

  no_std
  PyO3/pyo3#6490 · Filter by author Person-93 opened on Oct 8, 2026
  2

• with_critical_section_mutex APIs probably should poison their mutexes

  Bug

  PyO3/pyo3#6460 · Filter by author davidhewitt opened on Sep 28, 2026

• Xcode-provided python uses the wrong libdir

  Bug

  PyO3/pyo3#6415 · Filter by author madsmtm opened on Sep 14, 2026
  7

• CI: Inefficent caching of rust builds

  CI
  PyO3/pyo3#6405 · Filter by author Person-93 opened on Sep 11, 2026
  3

• Type stubs customization

  PyO3/pyo3#6399 · Filter by author Tpt opened on Sep 9, 2026
  6

• Borrowed constructor argument can outlive its owner

  Bug

  PyO3/pyo3#6392 · Filter by author Eclips4 opened on Sep 6, 2026
  1

• Assign an alias to a type hint

  Feature

  PyO3/pyo3#6347 · Filter by author anuraaga opened on Aug 24, 2026

• DefaultHasher for no_std

  no_std
  PyO3/pyo3#6329 · Filter by author Person-93 opened on Aug 18, 2026
  4

• Use of PyPyModule_FromDefAndSpec2 is broken with pypy 7.3.19

  PyO3/pyo3#6305 · Filter by author bemoody opened on Aug 6, 2026
  1

• sdist release of pyo3-introspection 0.29.2 failed

  PyO3/pyo3#6303 · Filter by author davidhewitt opened on Aug 6, 2026
  1

• GlobalAlloc that uses PyMem_Raw* methods

  Feature

  PyO3/pyo3#6268 · Filter by author anuraaga opened on Jul 31, 2026
  21

• Unsoundness in buffer APIs

  Unsound
  PyO3/pyo3#6267 · Filter by author Person-93 opened on Jul 31, 2026
  7

• Python 3.15 final will allow including platform tags in stable abi extension filenames

  PyO3/pyo3#6258 · Filter by author ngoldbaum opened on Jul 28, 2026
  1

• experimental-inspect: Add stubtest test in CI to ensure generated stubfiles match binary interfaces

  Feature

  PyO3/pyo3#6240 · Filter by author jonasdedden opened on Jul 25, 2026

• experimental-inspect: PyList / PyDict / PyTuple emit bare list / dict / tuple, which fail mypy --strict

  Bug

  PyO3/pyo3#6236 · Filter by author jonasdedden opened on Jul 24, 2026

• PyDict::iter don't align with python semantics

  PyO3/pyo3#6222 · Filter by author OutSquareCapital opened on Jul 21, 2026

• switch to build.warnings in CI

  easygithub-actions
  Feature

  PyO3/pyo3#6205 · Filter by author mejrs opened on Jul 15, 2026

• Error Message for methods that return Self for classes that are subclasses of other classes.

  Feature

  PyO3/pyo3#6197 · Filter by author scott-wilson opened on Jul 11, 2026

• Panic payload is replaced at FFI boundary instead of transported across

  PyO3/pyo3#6194 · Filter by author Person-93 opened on Jul 7, 2026
  2

• pyo3-build-config: CONDA_PREFIX set but no valid Python interpreter causes build failure

  PyO3/pyo3#6177 · Filter by author trim21 opened on Jul 1, 2026
  1