[pygame] Automatic Import Problem

[Kris Schnee]

I noticed a problem over lunch. I was trying to re-incorporate that 
little 2D tiled graphics engine into my latest project (is there a 
commented version of that super-fast one someone posted?), and found 
that it seemed to be importing my "art" module, even though that module 
wasn't in the same directory. I think that Python was loading _a_ 
version of "art.py" from _somewhere_, and the fact that I can't tell 
from where bothers me. What are the circumstances in which this happens?