Placing the entire library tree in /usr/lib64 is wasteful on dual 
32/64bit installation, but placing just the C modules there is contrary 
to python import logic and may cause problems to relative imports.

I have suggested what I believed was a workable solution: have 64-bit 
python search lib64-dynload subdirectories instead of lib-dynload.

See http://mail.python.org/pipermail/python-dev/2007-April/072653.html

Currently $(prefix)/pythonX.Y/lib-dynload is inserted in the sys.path, 
but I think it would be better to handle this inside the importer in a 
way similar to how the importer looks for both foo.so and foomodule.so 
when importing foo. This would allow submodules and user modules treated  
the same way.