pygame question

[Michael Bauers]

I was curious as to why 'is K_SPACE' worked, but 'is K_r' did not.  I had to
change the test for 'r' to ==.

* code snippet *
            elif (event.type is KEYDOWN and event.key is
               K_SPACE):
                # DO SOMETHING
            elif (event.type is KEYDOWN and
                  event.key == K_r):
               # DO SOMETHING ELSE