function : PyErr_Restore @ (file: "Python-3.3.0a4/Python/errors.c", line: 27)~49
    PyThreadState *tstate = PyThreadState_GET();
    PyObject *oldtype, *oldvalue, *oldtraceback;

    if (traceback != NULL && !PyTraceBack_Check(traceback)) {
        /* XXX Should never happen -- fatal error instead? */
        /* Well, it could be None. */
        Py_DECREF(traceback);
        traceback = NULL;
    }

    /* Save these in locals to safeguard against recursive
       invocation through Py_XDECREF */
    oldtype = tstate->curexc_type;
    oldvalue = tstate->curexc_value;
    oldtraceback = tstate->curexc_traceback;

    tstate->curexc_type = type;
    tstate->curexc_value = value;
    tstate->curexc_traceback = traceback;

    Py_XDECREF(oldtype);
    Py_XDECREF(oldvalue);
    Py_XDECREF(oldtraceback);

function : PyErr_SetExcInfo @ (file: "Python-3.3.0a4/Python/errors.c", line: 341)~353
    PyThreadState *tstate = PyThreadState_GET();

    oldtype = tstate->exc_type;
    oldvalue = tstate->exc_value;
    oldtraceback = tstate->exc_traceback;

    tstate->exc_type = p_type;
    tstate->exc_value = p_value;
    tstate->exc_traceback = p_traceback;

    Py_XDECREF(oldtype);
    Py_XDECREF(oldvalue);
    Py_XDECREF(oldtraceback);