64 bit python

[McKay Hyde]

I am interested in compiling a 64-bit version of python for use in my
electromagnetic scattering code.  In particular, we use python for
setting up the scattering geometries and for postprocessing and then
call C++ code (through SWIG wrappers) to compute the scattered field. 
I would like to extend the code to make use of the shared memory on an
IBM SP (AIX operating system) at my university (through OpenMP calls
in the C++ code).  However, to address more than 2GB of memory, I need
a 64-bit version of my code, including a 64-bit version of python.

Can anyone help?