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73 lines
2.7 KiB
ReStructuredText
73 lines
2.7 KiB
ReStructuredText
.. highlight:: c
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.. _apiabiversion:
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***********************
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API and ABI Versioning
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***********************
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CPython exposes its version number in the following macros.
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Note that these correspond to the version code is **built** with,
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not necessarily the version used at **run time**.
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See :ref:`stable` for a discussion of API and ABI stability across versions.
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.. c:macro:: PY_MAJOR_VERSION
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The ``3`` in ``3.4.1a2``.
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.. c:macro:: PY_MINOR_VERSION
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The ``4`` in ``3.4.1a2``.
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.. c:macro:: PY_MICRO_VERSION
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The ``1`` in ``3.4.1a2``.
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.. c:macro:: PY_RELEASE_LEVEL
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The ``a`` in ``3.4.1a2``.
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This can be ``0xA`` for alpha, ``0xB`` for beta, ``0xC`` for release
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candidate or ``0xF`` for final.
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.. c:macro:: PY_RELEASE_SERIAL
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The ``2`` in ``3.4.1a2``. Zero for final releases.
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.. c:macro:: PY_VERSION_HEX
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The Python version number encoded in a single integer.
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The underlying version information can be found by treating it as a 32 bit
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number in the following manner:
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+-------+-------------------------+-------------------------+--------------------------+
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| Bytes | Bits (big endian order) | Meaning | Value for ``3.4.1a2`` |
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+=======+=========================+=========================+==========================+
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| 1 | 1-8 | ``PY_MAJOR_VERSION`` | ``0x03`` |
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+-------+-------------------------+-------------------------+--------------------------+
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| 2 | 9-16 | ``PY_MINOR_VERSION`` | ``0x04`` |
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+-------+-------------------------+-------------------------+--------------------------+
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| 3 | 17-24 | ``PY_MICRO_VERSION`` | ``0x01`` |
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+-------+-------------------------+-------------------------+--------------------------+
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| 4 | 25-28 | ``PY_RELEASE_LEVEL`` | ``0xA`` |
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+ +-------------------------+-------------------------+--------------------------+
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| | 29-32 | ``PY_RELEASE_SERIAL`` | ``0x2`` |
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+-------+-------------------------+-------------------------+--------------------------+
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Thus ``3.4.1a2`` is hexversion ``0x030401a2`` and ``3.10.0`` is
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hexversion ``0x030a00f0``.
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Use this for numeric comparisons, e.g. ``#if PY_VERSION_HEX >= ...``.
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This version is also available via the symbol :c:var:`Py_Version`.
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.. c:var:: const unsigned long Py_Version
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The Python runtime version number encoded in a single constant integer, with
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the same format as the :c:macro:`PY_VERSION_HEX` macro.
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This contains the Python version used at run time.
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.. versionadded:: 3.11
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All the given macros are defined in :source:`Include/patchlevel.h`.
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