Jython在android studio 中使用报错

Question

public void callPython(){
    try{
        PythonInterpreter interpreter = new PythonInterpreter();
        interpreter.execfile("track.py");
        PyFunction func = interpreter.get("test_read",PyFunction.class);
        String filepath = "loop.xml";
        PyObject pyobj = func.__call__(new PyString(filepath));
        Log.d(TAG, "callPython: "+pyobj.toString());
    }catch (Exception e){
        Log.d(TAG, "callPython: -----"+ e);
    }
}

第一句创建对象时报错 MainActivity: callPython: -----java.lang.NullPointerException: Attempt to invoke virtual method 'org.python.core.PyType org.python.core.PyObject.getType()' on a null object reference