晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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.. 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`.

haha - 2025