Index: Objects/structseq.c
===================================================================
--- Objects/structseq.c	(.../p3yk)	(revision 53047)
+++ Objects/structseq.c	(.../p3yk-noslice)	(revision 53047)
@@ -90,6 +90,54 @@
 }
 
 static PyObject *
+structseq_subscript(PyStructSequence *self, PyObject *item)
+{
+	if (PyIndex_Check(item)) {
+		Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
+		if (i == -1 && PyErr_Occurred())
+			return NULL;
+
+		if (i < 0)
+			i += VISIBLE_SIZE(self);
+
+		if (i < 0 || i >= VISIBLE_SIZE(self)) {
+			PyErr_SetString(PyExc_IndexError,
+				"tuple index out of range");
+			return NULL;
+		}
+		Py_INCREF(self->ob_item[i]);
+		return self->ob_item[i];
+	}
+	else if (PySlice_Check(item)) {
+		Py_ssize_t start, stop, step, slicelen, cur, i;
+		PyObject *result;
+		
+		if (PySlice_GetIndicesEx((PySliceObject *)item,
+					 VISIBLE_SIZE(self), &start, &stop,
+					 &step, &slicelen) < 0) {
+			return NULL;
+		}
+		if (slicelen <= 0)
+			return PyTuple_New(0);
+		result = PyTuple_New(slicelen);
+		if (result == NULL)
+			return NULL;
+		for (cur = start, i = 0; i < slicelen;
+		     cur += step, i++) {
+			PyObject *v = self->ob_item[cur];
+			Py_INCREF(v);
+			PyTuple_SET_ITEM(result, i, v);
+		}
+		return result;
+	}
+	else {
+		PyErr_SetString(PyExc_TypeError,
+				"structseq indices must be integers");
+		return NULL;
+	}
+}
+
+static PyObject *
 structseq_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
 	PyObject *arg = NULL;
@@ -298,6 +346,11 @@
 	(objobjproc)structseq_contains,	        /* sq_contains */
 };
 
+static PyMappingMethods structseq_as_mapping = {
+	(lenfunc)structseq_length,
+	(binaryfunc)structseq_subscript,
+};
+
 static PyMethodDef structseq_methods[] = {
 	{"__reduce__", (PyCFunction)structseq_reduce, 
 	 METH_NOARGS, NULL},
@@ -318,7 +371,7 @@
 	(reprfunc)structseq_repr,             	/* tp_repr */
 	0,					/* tp_as_number */
 	&structseq_as_sequence,			/* tp_as_sequence */
-	0,					/* tp_as_mapping */
+	&structseq_as_mapping,			/* tp_as_mapping */
 	structseq_hash,				/* tp_hash */
 	0,              			/* tp_call */
 	0,					/* tp_str */
Index: Lib/test/test_structseq.py
===================================================================
--- Lib/test/test_structseq.py	(.../p3yk)	(revision 53047)
+++ Lib/test/test_structseq.py	(.../p3yk-noslice)	(revision 53047)
@@ -97,6 +97,18 @@
         t = time.gmtime()
         x = t.__reduce__()
 
+    def test_extended_getslice(self):
+        # Test extended slicing by comparing with list slicing.
+        t = time.gmtime()
+        L = list(t)
+        indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
+        for start in indices:
+            for stop in indices:
+                # Skip step 0 (invalid)
+                for step in indices[1:]:
+                    self.assertEqual(list(t[start:stop:step]),
+                                     L[start:stop:step])
+
 def test_main():
     test_support.run_unittest(StructSeqTest)