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gh-140550: Single What's New highlight for PEPs 793, 803 and 820 #149397

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encukou merged 1 commit into from
May 5, 2026
+15 −6
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gh-140550: Single What's New highlight for PEPs 793, 803 and 820 #149397

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21 changes: 15 additions & 6 deletions Doc/whatsnew/3.15.rst
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Expand Up @@ -87,8 +87,9 @@ Summary -- Release highlights
* :pep:`800`: Disjoint bases in the type system
* :pep:`782`: :ref:`A new PyBytesWriter C API to create a Python bytes object
<whatsnew315-pybyteswriter>`
* :pep:`803`: :ref:`Stable ABI for Free-Threaded Builds <whatsnew315-abi3t>`
* :pep:`820`: :ref:`PySlot: Unified slot system for the C API <whatsnew315-pyslot>`
* :pep:`803`, :pep:`820 <820>`, :pep:`793 <793>`:
:ref:`Stable ABI for Free-Threaded Builds <whatsnew315-abi3t>` and
related C API
* :ref:`The JIT compiler has been significantly upgraded <whatsnew315-jit>`
* :ref:`Improved error messages <whatsnew315-improved-error-messages>`
* :ref:`The official Windows 64-bit binaries now use the tail-calling interpreter
Expand Down Expand Up @@ -453,7 +454,7 @@ agen() for x in a)``.

.. _whatsnew315-abi3t:

:pep:`803`: ``abi3t`` -- Stable ABI for Free-Threaded Builds
:pep:`803` -- Stable ABI for Free-Threaded Builds
------------------------------------------------------------

C extensions that target the :ref:`Stable ABI <stable-abi>` can now be
Expand All @@ -469,7 +470,12 @@ specifically:
part of the instance struct; and
- Switching from a ``PyInit_`` function to a new export hook,
:c:func:`PyModExport_* <PyModExport_modulename>`, introduced for this
purpose in :pep:`793`.
purpose in :pep:`793`, with a new :c:type:`PySlot` structure
introduced in :pep:`820`.

The reference documentation for these features is complete, but currently
aimed at early adopters.
A migration guide is planned for an upcoming beta release.

Note that Stable ABI does not offer all the functionality that CPython
has to offer.
Expand Down Expand Up @@ -2199,6 +2205,11 @@ New features
* Add :c:func:`PyTuple_FromArray` to create a :class:`tuple` from an array.
(Contributed by Victor Stinner in :gh:`111489`.)

* Add a new module export hook,
:c:func:`PyModExport_* <PyModExport_modulename>`.

(Contributed by Petr Viktorin in :pep:`793` and :gh:`140550`.)

* Add functions that are guaranteed to be safe for use in
:c:member:`~PyTypeObject.tp_traverse` handlers:
:c:func:`PyObject_GetTypeData_DuringGC`,
Expand All @@ -2214,8 +2225,6 @@ New features
It should only be used for debugging.
(Contributed by Victor Stinner in :gh:`141070`.)

.. _whatsnew315-pyslot:

* Implement :pep:`820`: ``PySlot`` -- Unified slot system for the C API.
See :ref:`capi-slots` for documentation.

Expand Down
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