The idea is the following:
Ta-da: Instant native-code performance, with no explicit pre-compilation step. CodePy can also help you with the generation of the code, by letting you build a data structure and turning that into C code. CodePy works well with Boost.Python and PyCuda. In conjunction with the latter, it offers an easy way of doing GPU Metaprogramming, a very effective tuning technique for the GPU.