-level Python
        interfaces. 

        <p>The cctbx grew together with Boost.Python and is designed from the
        ground up as a hybrid Python/C++ system. With one minor exception,
        run-time polymorphism is completely handled by Python. C++
        compile-time polymorphism is used to implement performance critical
        algorithms. The Python and C++ layers are seamlessly integrated using
        Boost.Python.</p>

        <p>The SourceForge cctbx project is organized in modules to
       