Cross-Platform Readkey (one more try...)

[Dustan]

I've posted this before, but not gotten an answer:

I found this site that has code that does readkey for Windows, Unix,
and in an updated version, Mac:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/134892
The Mac readkey class returns a character whether or not a key was
pressed.  I modified the Windows class to do the same when I downloaded
it, but I have no idea how to make the Unix class to do so. Any help???