Improve byte-compilation in packaging to be independent of -O or -B. The code I fixed to comply with PEP 3147 still had one bug: When run under python -O, some paths for pyc files would be pyo, because I called imp.cache_from_source without explicit debug_override argument in some places, and under -O that would return .pyo (this is well explained in the imp docs). Now all code (util.byte_compile, build_py, install_lib) can create .pyo files according to options given by users, without interference from the calling Python’s own optimize mode. On a related topic, I also removed the code that prevented byte compilation under python -B. The rationale is that packaging gives control over the creation of pyc files to the user with its own explicit option, and the behavior should not be changed if the calling Python happens to run with -B for whatever reason. I will argue that this is a bug fix and ask to be allowed to backport this change to distutils. Finally, I moved one nugget of information about the --compile and --optimize options from the source into the doc. It clears up a misunderstanding that I (and maybe other people) had.

/* Python version identification scheme.

   When the major or minor version changes, the VERSION variable in
   configure.in must also be changed.

   There is also (independent) API version information in modsupport.h.
*/

/* Values for PY_RELEASE_LEVEL */
#define PY_RELEASE_LEVEL_ALPHA	0xA
#define PY_RELEASE_LEVEL_BETA	0xB
#define PY_RELEASE_LEVEL_GAMMA	0xC     /* For release candidates */
#define PY_RELEASE_LEVEL_FINAL	0xF	/* Serial should be 0 here */
					/* Higher for patch releases */

/* Version parsed out into numeric values */
/*--start constants--*/
#define PY_MAJOR_VERSION	3
#define PY_MINOR_VERSION	3
#define PY_MICRO_VERSION	0
#define PY_RELEASE_LEVEL	PY_RELEASE_LEVEL_ALPHA
#define PY_RELEASE_SERIAL	0

/* Version as a string */
#define PY_VERSION      	"3.3.0a0"
/*--end constants--*/

/* Version as a single 4-byte hex number, e.g. 0x010502B2 == 1.5.2b2.
   Use this for numeric comparisons, e.g. #if PY_VERSION_HEX >= ... */
#define PY_VERSION_HEX ((PY_MAJOR_VERSION << 24) | \
			(PY_MINOR_VERSION << 16) | \
			(PY_MICRO_VERSION <<  8) | \
			(PY_RELEASE_LEVEL <<  4) | \
			(PY_RELEASE_SERIAL << 0))