API and ABI Versioning¶

PY_VERSION_HEX is the Python version number encoded in a single integer.

For example if thePY_VERSION_HEX is set to0x030401a2, the underlyingversion information can be found by treating it as a 32 bit number inthe following manner:

Bytes	Bits (big endian order)	Meaning
1	1-8	PY_MAJOR_VERSION (the3 in3.4.1a2)
2	9-16	PY_MINOR_VERSION (the4 in3.4.1a2)
3	17-24	PY_MICRO_VERSION (the1 in3.4.1a2)
4	25-28	PY_RELEASE_LEVEL (0xA for alpha,0xB for beta,0xC for releasecandidate and0xF for final), in thiscase it is alpha.
	29-32	PY_RELEASE_SERIAL (the2 in3.4.1a2, zero for final releases)

Thus3.4.1a2 is hexversion0x030401a2.

All the given macros are defined inInclude/patchlevel.h.