I am looking for help from a developer to do this : Baiju M

static PyObject *
pygtk_tree_model_row_slice(PyGtkTreeModelRow *self, gint low, gint high)
{
    gint n_columns;
    GValue value = { 0, };
    PyObject *ret;
    gint i;

    printf("Before %d %d\n", low, high);
    n_columns = gtk_tree_model_get_n_columns(self->model);
    if (low < 0)
        low = 0;
    else if (low > n_columns)
        low = n_columns;
    if (high < 0)
        high = 0;
    if (high < low)
        high = low;
    else if (high > n_columns)
        high = n_columns;
    ret = PyList_New(0);
    printf("After %d %d %d\n", low, high, n_columns);
    for (i = low; i < high; i++) {
        printf("%d\n", i);
        PyObject *o;
        gtk_tree_model_get_value(self->model, &self->iter, i, &value);
        o = pyg_value_as_pyobject(&value, TRUE);
        PyList_Append(ret, o);
        g_value_unset(&value);
        /*FIXME: Is Py_DECREF required?
          Py_DECREF(o);
        */
    }
    return ret;
}

But when 'low' and 'high' is giving as negative, its getting as 1 (one)

Here is a test :

>>> import pygtk
>>> pygtk.require('2.0')
>>> import gtk
>>> a = gtk.ListStore(int, int, int)
>>> a.append((0,1,2))
<GtkTreeIter at 0x825a560>
>>> a[0][-2:3]
Before 1 3
After 1 3 3
1
2
[1, 2]
>>> 

Here is the diff against 2.6.2 :

--- gtk-types.c.orig    2005-07-24 17:49:30.000000000 +0530
+++ gtk-types.c 2005-07-24 18:38:22.000000000 +0530
@@ -888,6 +888,42 @@
     return ret;
 }
 
+static PyObject *
+pygtk_tree_model_row_slice(PyGtkTreeModelRow *self, gint low, gint high)
+{
+    gint n_columns;
+    GValue value = { 0, };
+    PyObject *ret;
+    gint i;
+
+    printf("Before %d %d\n", low, high);
+    n_columns = gtk_tree_model_get_n_columns(self->model);
+    if (low < 0)
+       low = 0;
+    else if (low > n_columns)
+       low = n_columns;
+    if (high < 0)
+       high = 0;
+    if (high < low)
+       high = low;
+    else if (high > n_columns)
+       high = n_columns;
+    ret = PyList_New(0);
+    printf("After %d %d %d\n", low, high, n_columns);
+    for (i = low; i < high; i++) {
+       printf("%d\n", i);
+       PyObject *o;
+       gtk_tree_model_get_value(self->model, &self->iter, i, &value);
+       o = pyg_value_as_pyobject(&value, TRUE);
+       PyList_Append(ret, o);
+       g_value_unset(&value);
+       /*FIXME: Is Py_DECREF required?
+         Py_DECREF(o);
+       */
+    }
+    return ret;
+}
+
 static int
 pygtk_tree_model_row_setitem(PyGtkTreeModelRow *self, gint column,
                             PyObject *pyvalue)
@@ -925,13 +961,13 @@
 }
 
 static PySequenceMethods pygtk_tree_model_row_seqmethods = {
-    (inquiry)pygtk_tree_model_row_length,
-    (binaryfunc)0,
-    (intargfunc)0,
-    (intargfunc)pygtk_tree_model_row_getitem,
-    (intintargfunc)0,
-    (intobjargproc)pygtk_tree_model_row_setitem,
-    (intintobjargproc)0
+    (inquiry)pygtk_tree_model_row_length,/*sq_length*/
+    (binaryfunc)0,/*sq_concat*/
+    (intargfunc)0,/*sq_repeat*/
+    (intargfunc)pygtk_tree_model_row_getitem,/*sq_item*/
+    (intintargfunc)pygtk_tree_model_row_slice,/*sq_slice*/
+    (intobjargproc)pygtk_tree_model_row_setitem,/*sq_ass_item*/
+    (intintobjargproc)0/*sq_ass_slice*/
 };
 
 static PyObject *