/data/refman/pasoursint/CMSSW_5_3_0/src/FWCore/Python/src/PythonManager.cc

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#include "PythonManager.h"
#include "FWCore/Utilities/interface/Exception.h"

    void
    pythonToCppException(const std::string& iType)
    {
       using namespace boost::python;
       PyObject *exc, *val, *trace;
       PyErr_Fetch(&exc,&val,&trace);
       handle<> hExc(allow_null(exc));
       if(hExc) {
          object oExc(hExc);
       }
       handle<> hVal(allow_null(val));
       handle<> hTrace(allow_null(trace));
       if(hTrace) {
          object oTrace(hTrace);
       }

       if(hVal) {
          object oVal(hVal);
          handle<> hStringVal(PyObject_Str(oVal.ptr()));
          object stringVal( hStringVal );

          //PyErr_Print();
          throw cms::Exception(iType) <<"python encountered the error: "<< PyString_AsString(stringVal.ptr())<<"\n";
       } else {
          throw cms::Exception(iType)<<" unknown python problem occurred.\n";
       }
    }

    PythonManagerHandle PythonManager::handle() {
        static PythonManager s_manager;
        return PythonManagerHandle( s_manager);
    }

    PythonManager::PythonManager() :
        refCount_(0),
        initCommand_(
            "import sys\n"
            "sys.path.append('./')\n"
            "import ROOT\n"
            "ROOT.gSystem.Load(\"libFWCoreFWLite\")\n"
            "ROOT.AutoLibraryLoader.enable()\n"
            "import libFWCorePython as edm\n")
    {
       Py_InitializeEx(0);
       using namespace boost::python;

       if(PyImport_AppendInittab(const_cast<char *>("libFWCorePython"),initlibFWCorePython)==-1) {
         throw cms::Exception("InitializationFailure" )
          <<"failed to add libFWCorePython python module to python interpreter";
       }
       object main_module((
                           boost::python::handle<PyObject>(borrowed(PyImport_AddModule(const_cast<char *>("__main__"))))));
       object main_namespace = main_module.attr("__dict__");
       try {
           object result((boost::python::handle<>(PyRun_String(initCommand_.c_str(),
                                           Py_file_input,
                                           main_namespace.ptr(),
                                           main_namespace.ptr()))));

       } catch(...  ) {
         throw cms::Exception("Configuration") << "test";
       }

    }