[Pythonmac-SIG] How to get MacOS X version?

[Russell E. Owen]

How can I get the version of MacOS X within a python program?
(e.g. 10.4.5 -- something that is recognizable, rather than the kernel 
version).

In theory I can get it from gestalt, but I haven't figured out how to do 
it via the Carbon package, or even if it's possible.

Any hints?

-- Russell

P.S. I'm going to be trying to figure out the same thing for unix and 
even Windows. I think I know how to do those, but if you happen to know 
or have sample code, that'd be great.