Issue 2582: Fix pickling of xrange objects.

Lib/test/test_xrange.py

@@ -57,6 +57,16 @@ class XrangeTest(unittest.TestCase):
         self.assertEqual(len(r), sys.maxint)
         self.assertRaises(OverflowError, xrange, -sys.maxint-1, sys.maxint, 2)
 
+    def test_getnewargs(self):
+        def test(*args):
+            r = xrange(*args)
+            return list(r) == list(xrange(*r.__getnewargs__()))
+        tests = [(13,), (0, 11), (-22, 10), (20, 3, -1),
+                 (13, 21, 3), (-2, 2, 2)]
+        for t in tests:
+            self.assert_(test(*t),
+                         "xrange.__getnewargs__() failed with %r" % (t,))
+
 def test_main():
     test.test_support.run_unittest(XrangeTest)
 

Objects/rangeobject.c

@@ -129,6 +129,16 @@ range_repr(rangeobject *r)
 	return rtn;
 }
 
+/* Pickling support */
+static PyObject *
+range_getnewargs(rangeobject *r)
+{
+	return Py_BuildValue("(iii)",
+			     r->start,
+			     r->start + r->len * r->step,
+			     r->step);
+}
+
 static PySequenceMethods range_as_sequence = {
 	(lenfunc)range_length,	/* sq_length */
 	0,			/* sq_concat */
@@ -145,6 +155,7 @@ PyDoc_STRVAR(reverse_doc,
 
 static PyMethodDef range_methods[] = {
 	{"__reversed__",	(PyCFunction)range_reverse, METH_NOARGS, reverse_doc},
+	{"__getnewargs__",	(PyCFunction)range_getnewargs, METH_NOARGS},
  	{NULL,		NULL}		/* sentinel */
 };