Index: Include/listobject.h
===================================================================
--- Include/listobject.h	(revision 58651)
+++ Include/listobject.h	(working copy)
@@ -36,6 +36,7 @@
      * the list is not yet visible outside the function that builds it.
      */
     Py_ssize_t allocated;
+	int val_removed_state;
 } PyListObject;
 
 PyAPI_DATA(PyTypeObject) PyList_Type;
Index: Objects/listobject.c
===================================================================
--- Objects/listobject.c	(revision 58651)
+++ Objects/listobject.c	(working copy)
@@ -628,7 +628,7 @@
 	if (d < 0) { /* Delete -d items */
 		memmove(&item[ihigh+d], &item[ihigh],
 			(Py_Size(a) - ihigh)*sizeof(PyObject *));
-		list_resize(a, Py_Size(a) + d);
+		list_resize(a, Py_Size(a) +d); 
 		item = a->ob_item;
 	}
 	else if (d > 0) { /* Insert d items */
@@ -2273,7 +2273,10 @@
 		if (cmp > 0) {
 			if (list_ass_slice(self, i, i+1,
 					   (PyObject *)NULL) == 0)
-				Py_RETURN_NONE;
+            {
+                self->val_removed_state = 1;
+                Py_RETURN_NONE;
+            }
 			return NULL;
 		}
 		else if (cmp < 0)
@@ -2390,6 +2393,7 @@
 			return -1;
 		Py_DECREF(rv);
 	}
+    self->val_removed_state=0;
 	return 0;
 }
 
@@ -2823,7 +2827,13 @@
 	seq = it->it_seq;
 	if (seq == NULL)
 		return NULL;
-	assert(PyList_Check(seq));
+    assert(PyList_Check(seq));
+    if(it->it_seq->val_removed_state)
+    {
+        if(it->it_index>0)
+            --it->it_index;
+        it->it_seq->val_removed_state = 0;
+    }
 
 	if (it->it_index < PyList_GET_SIZE(seq)) {
 		item = PyList_GET_ITEM(seq, it->it_index);