keypressed() function

[pinkfloydhomer at gmail.com]

I need a function (blocking or non-blocking) that tells me if a key has
been pressed (even before it has been released etc.). Also, I would of
course like to know _which_ key has been pressed.

I know that this probably does not exist in the Python library already
as a platform-independant abstraction (even though it probably could),
but then I would at least like solutions that works on Windows and on
Linux.

/David