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.. highlight:: 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`.
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