FM / c-api

/usr/share/doc/python3-docs/html/_sources/c-api/

/usr/share/doc/python3-docs/html/_sources/c-api

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abstract.rst.txt	715	0644	edit dl rm
allocation.rst.txt	2653	0644	edit dl rm
apiabiversion.rst.txt	2242	0644	edit dl rm
arg.rst.txt	30651	0644	edit dl rm
bool.rst.txt	1200	0644	edit dl rm
buffer.rst.txt	22267	0644	edit dl rm
bytearray.rst.txt	2250	0644	edit dl rm
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capsule.rst.txt	5741	0644	edit dl rm
cell.rst.txt	1940	0644	edit dl rm
code.rst.txt	1666	0644	edit dl rm
codec.rst.txt	4799	0644	edit dl rm
complex.rst.txt	3946	0644	edit dl rm
concrete.rst.txt	2046	0644	edit dl rm
conversion.rst.txt	5516	0644	edit dl rm
coro.rst.txt	820	0644	edit dl rm
datetime.rst.txt	6415	0644	edit dl rm
descriptor.rst.txt	1111	0644	edit dl rm
dict.rst.txt	7952	0644	edit dl rm
exceptions.rst.txt	47814	0644	edit dl rm
file.rst.txt	3248	0644	edit dl rm
float.rst.txt	2243	0644	edit dl rm
function.rst.txt	3348	0644	edit dl rm
gcsupport.rst.txt	6057	0644	edit dl rm
gen.rst.txt	1301	0644	edit dl rm
import.rst.txt	12825	0644	edit dl rm
index.rst.txt	613	0644	edit dl rm
init.rst.txt	52383	0644	edit dl rm
intro.rst.txt	28751	0644	edit dl rm
iter.rst.txt	1129	0644	edit dl rm
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long.rst.txt	10436	0644	edit dl rm
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memory.rst.txt	21369	0644	edit dl rm
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method.rst.txt	2818	0644	edit dl rm
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none.rst.txt	740	0644	edit dl rm
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stable.rst.txt	1969	0644	edit dl rm
structures.rst.txt	13787	0644	edit dl rm
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Edit: /usr/share/doc/python3-docs/html/_sources/c-api/stable.rst.txt (1969B)

.. highlightlang:: c

.. _stable:

***********************************
Stable Application Binary Interface
***********************************

Traditionally, the C API of Python will change with every release.  Most changes
will be source-compatible, typically by only adding API, rather than changing
existing API or removing API (although some interfaces do get removed after
being deprecated first).

Unfortunately, the API compatibility does not extend to binary compatibility
(the ABI). The reason is primarily the evolution of struct definitions, where
addition of a new field, or changing the type of a field, might not break the
API, but can break the ABI.  As a consequence, extension modules need to be
recompiled for every Python release (although an exception is possible on Unix
when none of the affected interfaces are used). In addition, on Windows,
extension modules link with a specific pythonXY.dll and need to be recompiled to
link with a newer one.

Since Python 3.2, a subset of the API has been declared to guarantee a stable
ABI. Extension modules wishing to use this API (called "limited API") need to
define ``Py_LIMITED_API``. A number of interpreter details then become hidden
from the extension module; in return, a module is built that works on any 3.x
version (x>=2) without recompilation.

In some cases, the stable ABI needs to be extended with new functions.
Extension modules wishing to use these new APIs need to set ``Py_LIMITED_API``
to the ``PY_VERSION_HEX`` value (see :ref:`apiabiversion`) of the minimum Python
version they want to support (e.g. ``0x03030000`` for Python 3.3). Such modules
will work on all subsequent Python releases, but fail to load (because of
missing symbols) on the older releases.

As of Python 3.2, the set of functions available to the limited API is
documented in :pep:`384`.  In the C API documentation, API elements that are not
part of the limited API are marked as "Not part of the limited API."

cmd: