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diff --git a/Doc/c-api/apiabiversion.rst b/Doc/c-api/apiabiversion.rst new file mode 100644 index 0000000..f6d52df --- /dev/null +++ b/Doc/c-api/apiabiversion.rst @@ -0,0 +1,39 @@ +.. highlightlang:: c + +.. _apiabiversion: + +*********************** +API and ABI Versioning +*********************** + +``PY_VERSION_HEX`` is the Python version number encoded in a single integer. + +For example if the ``PY_VERSION_HEX`` is set to ``0x030401a2``, the underlying +version information can be found by treating it as a 32 bit number in +the following manner: + + +-------+-------------------------+------------------------------------------------+ + | Bytes | Bits (big endian order) | Meaning | + +=======+=========================+================================================+ + | ``1`` | ``1-8`` | ``PY_MAJOR_VERSION`` (the ``3`` in | + | | | ``3.4.1a2``) | + +-------+-------------------------+------------------------------------------------+ + | ``2`` | ``9-16`` | ``PY_MINOR_VERSION`` (the ``4`` in | + | | | ``3.4.1a2``) | + +-------+-------------------------+------------------------------------------------+ + | ``3`` | ``17-24`` | ``PY_MICRO_VERSION`` (the ``1`` in | + | | | ``3.4.1a2``) | + +-------+-------------------------+------------------------------------------------+ + | ``4`` | ``25-28`` | ``PY_RELEASE_LEVEL`` (``0xA`` for alpha, | + | | | ``0xB`` for beta, ``0xC`` for release | + | | | candidate and ``0xF`` for final), in this | + | | | case it is alpha. | + | +-------------------------+------------------------------------------------+ + | | ``29-32`` | ``PY_RELEASE_SERIAL`` (the ``2`` in | + | | | ``3.4.1a2``, zero for final releases) | + +-------+-------------------------+------------------------------------------------+ + +Thus ``3.4.1a2`` is hexversion ``0x030401a2``. + +All the given macros are defined in :source:`Include/patchlevel.h`. + |