API and ABI Versioning¶
CPython exposes its version number in the following macros. Note that these correspond to the version code is built with, not necessarily the version used at run time.
See C API Stability for a discussion of API and ABI stability across versions.
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PY_MAJOR_VERSION¶
- The - 3in- 3.4.1a2.
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PY_MINOR_VERSION¶
- The - 4in- 3.4.1a2.
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PY_MICRO_VERSION¶
- The - 1in- 3.4.1a2.
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PY_RELEASE_LEVEL¶
- The - ain- 3.4.1a2. This can be- 0xAfor alpha,- 0xBfor beta,- 0xCfor release candidate or- 0xFfor final.
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PY_RELEASE_SERIAL¶
- The - 2in- 3.4.1a2. Zero for final releases.
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PY_VERSION_HEX¶
- The Python version number encoded in a single integer. - 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 - Value for - 3.4.1a2- 1 - 1-8 - PY_MAJOR_VERSION- 0x03- 2 - 9-16 - PY_MINOR_VERSION- 0x04- 3 - 17-24 - PY_MICRO_VERSION- 0x01- 4 - 25-28 - PY_RELEASE_LEVEL- 0xA- 29-32 - PY_RELEASE_SERIAL- 0x2- Thus - 3.4.1a2is hexversion- 0x030401a2and- 3.10.0is hexversion- 0x030a00f0.- Use this for numeric comparisons, e.g. - #if PY_VERSION_HEX >= ....- This version is also available via the symbol - Py_Version.
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const unsigned long Py_Version¶
-  Part of the Stable ABI since version 3.11.The Python runtime version number encoded in a single constant integer, with the same format as the PY_VERSION_HEXmacro. This contains the Python version used at run time.New in version 3.11. 
All the given macros are defined in Include/patchlevel.h.