Python ghost compile

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I split a large python (2.5.1) program into three modules. Let's call them 
mainmod, submod1, and submod2. mainmod imports submod1 and submod2. When I 
make changes to any of these modules, it is not reflected in the 
compile.  Only if exit idle and re-run idle. I've removed the two relevant 
.pyc files. It holds onto the first compile made after starting idle. I've 
triple-checked the names I've given the modules, they're all unique. Any 
clues?