Fix test case I()

Author: rhettinger

Lib/test/test_itertools.py

@@ -2043,7 +2043,7 @@ def test_batched(self):
         s = 'abcde'
         r = [['a', 'b'], ['c', 'd'], ['e']]
         n = 2
-        for g in (G, Ig, L, R):     # XXX I(s) is failing
+        for g in (G, I, Ig, L, R):
             with self.subTest(g=g):
                 self.assertEqual(list(batched(g(s), n)), r)
         self.assertEqual(list(batched(S(s), 2)), [])

Modules/itertoolsmodule.c

@@ -155,7 +155,7 @@ batched_next(batchedobject *bo)
         return NULL;
     }
     for (i=0 ; i < bo->batch_size ; i++) {
-        item = (*Py_TYPE(it)->tp_iternext)(it);
+        item = PyIter_Next(it);
         if (item == NULL) {
             break;
         }