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Make a file called "test.py"
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import pack
print pack.func.func_code.co_filename
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Make a directory called "pack". Put a file in it 
called "__init__.py" with the contents:
def func(): pass
Now run test.py. It will compile a relative path into 
these modules. Now you can change to any directory on 
the system and run test.py and it will return the 
original relative path. The problem is that the 
relative path is compiled into the .pyc. It should be 
an absolute path.