Python defines some BSDish exit codes in the os module:

    EX_CANTCREAT = 73
    EX_CONFIG = 78
    EX_DATAERR = 65
    EX_IOERR = 74
    EX_NOHOST = 68
    EX_NOINPUT = 66
    EX_NOPERM = 77
    EX_NOUSER = 67
    EX_OK = 0
    EX_OSERR = 71
    EX_OSFILE = 72
    EX_PROTOCOL = 76
    EX_SOFTWARE = 70
    EX_TEMPFAIL = 75
    EX_UNAVAILABLE = 69
    EX_USAGE = 64

but these are documented as only available on UNIX and may not be portable across all flavors. 


POSIX [1] and C99 defines EXIT_SUCCESS and EXIT_FAILURE constants.  I propose adding those to sys.

Having these constants in sys will make them more discoverable because they will be next to sys.exit().


[1] http://pubs.opengroup.org/onlinepubs/009695399/functions/exit.html