My guess is that it is taken from an binary from python-2.4 package and represents kernel version at time of build.Then that indeed is a bug.
The main question is what should "sys.platform" really mean ? It looks like runtime detection is in module platform, please try platform.system() platform.release()
I also verified the installed FreeBSD kernel on my system and it says is kfreebsd-image-5.4-1-486 5.4-21. I don't see any FreeBSD 6.x series kernel image or utility installed on my box.Well, you should consider upgrade to 6.2 kernel ;-)Well! I don't think that'd be a solution. There'll be users who'll prefer sticking to FreeBSD 5.x kernel and there has been no announcement about 5.x kernel being obsoleted and unsupported.
The above hint only meant that 6.2 kernel is supported better.
I don't see any FreeBSD 6.x series kernel image or utility installed on my box.
Well, with up-to-date GNU/kFreeBSD you will have FreeBSD 6.2 based utilities, try "dpkg -la | grep -i freebsd"
Petr