diff --git a/src/Base/Interpreter.cpp b/src/Base/Interpreter.cpp
index b425b5663c..b4642fb89b 100644
--- a/src/Base/Interpreter.cpp
+++ b/src/Base/Interpreter.cpp
@@ -544,15 +544,8 @@ void InterpreterSingleton::addType(PyTypeObject* Type,PyObject* Module, const ch
 void InterpreterSingleton::addPythonPath(const char* Path)
 {
     PyGILStateLocker locker;
-    PyObject *list = PySys_GetObject("path");
-#if PY_MAJOR_VERSION >= 3
-    PyObject *path = PyUnicode_FromString(Path);
-#else
-    PyObject *path = PyString_FromString(Path);
-#endif
-    PyList_Append(list, path);
-    Py_DECREF(path);
-    PySys_SetObject("path", list);
+    Py::List list(PySys_GetObject("path"));
+    list.append(Py::String(Path));
 }
 
 const char* InterpreterSingleton::init(int argc,char *argv[])
diff --git a/src/Mod/Sketcher/App/ExternalGeometryFacadePyImp.cpp b/src/Mod/Sketcher/App/ExternalGeometryFacadePyImp.cpp
index a86bce0e22..13095bec3c 100644
--- a/src/Mod/Sketcher/App/ExternalGeometryFacadePyImp.cpp
+++ b/src/Mod/Sketcher/App/ExternalGeometryFacadePyImp.cpp
@@ -469,7 +469,7 @@ PyObject* ExternalGeometryFacadePy::getExtensions(PyObject *args)
     try {
         const std::vector<std::weak_ptr<const Part::GeometryExtension>> ext = this->getExternalGeometryFacadePtr()->getExtensions();
 
-        PyObject* list = PyList_New(0);
+        Py::List list;
 
         for (std::size_t i=0; i<ext.size(); ++i) {
 
@@ -478,9 +478,7 @@ PyObject* ExternalGeometryFacadePy::getExtensions(PyObject *args)
             if(p) {
                 // we create a python copy and add it to the list
                 try {
-                    PyObject* cpy = p->copyPyObject();
-                    PyList_Append( list, cpy);
-                    Py_DECREF(cpy);
+                    list.append(Py::asObject(p->copyPyObject()));
                 }
                 catch(Base::NotImplementedError) {
                     // silently ignoring extensions not having a Python object
@@ -488,7 +486,7 @@ PyObject* ExternalGeometryFacadePy::getExtensions(PyObject *args)
             }
         }
 
-        return list;
+        return Py::new_reference_to(list);
     }
     catch(const Base::ValueError& e) {
         PyErr_SetString(Part::PartExceptionOCCError, e.what());
diff --git a/src/Mod/Sketcher/App/GeometryFacadePyImp.cpp b/src/Mod/Sketcher/App/GeometryFacadePyImp.cpp
index 5ddf5885a4..ab00cba9b6 100644
--- a/src/Mod/Sketcher/App/GeometryFacadePyImp.cpp
+++ b/src/Mod/Sketcher/App/GeometryFacadePyImp.cpp
@@ -447,7 +447,7 @@ PyObject* GeometryFacadePy::getExtensions(PyObject *args)
     try {
         const std::vector<std::weak_ptr<const Part::GeometryExtension>> ext = this->getGeometryFacadePtr()->getExtensions();
 
-        PyObject* list = PyList_New(0);
+        Py::List list;
 
         for (std::size_t i=0; i<ext.size(); ++i) {
 
@@ -456,9 +456,7 @@ PyObject* GeometryFacadePy::getExtensions(PyObject *args)
             if(p) {
                 // we create a python copy and add it to the list
                 try {
-                    PyObject* cpy = p->copyPyObject();
-                    PyList_Append( list, cpy);
-                    Py_DECREF(cpy);
+                    list.append(Py::asObject(p->copyPyObject()));
                 }
                 catch(Base::NotImplementedError) {
                     // silently ignoring extensions not having a Python object
@@ -466,7 +464,7 @@ PyObject* GeometryFacadePy::getExtensions(PyObject *args)
             }
         }
 
-        return list;
+        return Py::new_reference_to(list);
     }
     catch(const Base::ValueError& e) {
         PyErr_SetString(Part::PartExceptionOCCError, e.what());