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gh-118915: C API: Document frame locals proxies. (#127720)

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Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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Peter Bierma 2024-12-11 11:28:44 -05:00 • committed by GitHub
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Doc/c-api/frame.rst
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@ -132,7 +132,7 @@ See also :ref:`Reflection <reflection>`.
.. versionadded:: 3.11 .. versionadded:: 3.11
.. versionchanged:: 3.13 .. versionchanged:: 3.13
As part of :pep:`667`, return a proxy object for optimized scopes. As part of :pep:`667`, return an instance of :c:var:`PyFrameLocalsProxy_Type`.
.. c:function:: int PyFrame_GetLineNumber(PyFrameObject *frame) .. c:function:: int PyFrame_GetLineNumber(PyFrameObject *frame)
@ -140,6 +140,26 @@ See also :ref:`Reflection <reflection>`.
Return the line number that *frame* is currently executing. Return the line number that *frame* is currently executing.
Frame Locals Proxies
^^^^^^^^^^^^^^^^^^^^
.. versionadded:: 3.13
The :attr:`~frame.f_locals` attribute on a :ref:`frame object <frame-objects>`
is an instance of a "frame-locals proxy". The proxy object exposes a
write-through view of the underlying locals dictionary for the frame. This
ensures that the variables exposed by ``f_locals`` are always up to date with
the live local variables in the frame itself.
See :pep:`667` for more information.
.. c:var:: PyTypeObject PyFrameLocalsProxy_Type
The type of frame :func:`locals` proxy objects.
.. c:function:: int PyFrameLocalsProxy_Check(PyObject *obj)
Return non-zero if *obj* is a frame :func:`locals` proxy.
Internal Frames Internal Frames
^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^