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This bug was reported because the encoding of the path in the 
.pyc generates errors in some tools (namely IDLE) as well as 
generates erroneous tracebacks when exceptions are raised.  
When some of the not very software savvy script writers see "/rfs/
proj/cse/scripts" in their traceback, instead of the "P:/scripts" that 
they expect, it leads to confusion.

I'm not sure why the __file__ and exception mechanism use 
different methods for determining the path to the file, but they 
do.  The same can be said for the value of having the fully 
qualified path encoded in the .pyc.