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gh-128813: deprecate cval field of the PyComplexObject struct (#137271)

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Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
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Sergey B Kirpichev 2025-08-08 13:36:42 +03:00 • committed by GitHub
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5 changed files with 29 additions and 2 deletions
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10
Doc/c-api/complex.rst
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@ -118,6 +118,16 @@ Complex Numbers as Python Objects
This subtype of :c:type:`PyObject` represents a Python complex number object. This subtype of :c:type:`PyObject` represents a Python complex number object.
.. c:member:: Py_complex cval
The complex number value, using the C :c:type:`Py_complex` representation.
.. deprecated-removed:: next 3.20
Use :c:func:`PyComplex_AsCComplex` and
:c:func:`PyComplex_FromCComplex` to convert a
Python complex number to/from the C :c:type:`Py_complex`
representation.
.. c:var:: PyTypeObject PyComplex_Type .. c:var:: PyTypeObject PyComplex_Type

7
Doc/deprecations/c-api-pending-removal-in-3.20.rst Normal file
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@ -0,0 +1,7 @@
Pending removal in Python 3.20
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
* The ``cval`` field in :c:type:`PyComplexObject` (:gh:`128813`).
Use :c:func:`PyComplex_AsCComplex` and :c:func:`PyComplex_FromCComplex`
to convert a Python complex number to/from the C :c:type:`Py_complex`
representation.

2
Doc/deprecations/index.rst
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@ -18,4 +18,6 @@ C API deprecations
.. include:: c-api-pending-removal-in-3.18.rst .. include:: c-api-pending-removal-in-3.18.rst
.. include:: c-api-pending-removal-in-3.20.rst
.. include:: c-api-pending-removal-in-future.rst .. include:: c-api-pending-removal-in-future.rst

7
Doc/whatsnew/3.15.rst
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@ -570,6 +570,13 @@ Deprecated C APIs
signed integer type of the same size is now deprecated. signed integer type of the same size is now deprecated.
(Contributed by Serhiy Storchaka in :gh:`132629`.) (Contributed by Serhiy Storchaka in :gh:`132629`.)
* Deprecate :c:member:`~PyComplexObject.cval` field of the the
:c:type:`PyComplexObject` type.
Use :c:func:`PyComplex_AsCComplex` and :c:func:`PyComplex_FromCComplex`
to convert a Python complex number to/from the C :c:type:`Py_complex`
representation.
(Contributed by Sergey B Kirpichev in :gh:`128813`.)
* Functions :c:func:`_Py_c_sum`, :c:func:`_Py_c_diff`, :c:func:`_Py_c_neg`, * Functions :c:func:`_Py_c_sum`, :c:func:`_Py_c_diff`, :c:func:`_Py_c_neg`,
:c:func:`_Py_c_prod`, :c:func:`_Py_c_quot`, :c:func:`_Py_c_pow` and :c:func:`_Py_c_prod`, :c:func:`_Py_c_quot`, :c:func:`_Py_c_pow` and
:c:func:`_Py_c_abs` are :term:`soft deprecated`. :c:func:`_Py_c_abs` are :term:`soft deprecated`.

5
Misc/NEWS.d/next/C_API/2025-07-31-04-30-42.gh-issue-128813.opL-Pv.rst
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@ -1,4 +1,5 @@
Functions :c:func:`_Py_c_sum`, :c:func:`_Py_c_diff`, :c:func:`_Py_c_neg`, Functions :c:func:`_Py_c_sum`, :c:func:`_Py_c_diff`, :c:func:`_Py_c_neg`,
:c:func:`_Py_c_prod`, :c:func:`_Py_c_quot`, :c:func:`_Py_c_pow` and :c:func:`_Py_c_prod`, :c:func:`_Py_c_quot`, :c:func:`_Py_c_pow` and previously
previously undocumented :c:func:`_Py_c_abs` are :term:`soft deprecated`. undocumented :c:func:`_Py_c_abs` are :term:`soft deprecated`. Deprecate also
:c:member:`~PyComplexObject.cval` field of the :c:type:`PyComplexObject` type.
Patch by Sergey B Kirpichev. Patch by Sergey B Kirpichev.