def test_update(self): od1 = OrderedDict() for i in range(10): od1[i] = 100 * i keys1 = od1.keys() od2 = OrderedDict() for i in range(10, 20): od2[i] = 100 * i od1.update(od2) for index, check in zip(od1.keys(), range(20)): self.assertEqual(index, check) od1._keyorder = keys1 od1.update(0, od2) for index, check in zip(od1.keys(), range(10, 20) + range(10)): self.assertEqual(index, check) self.assertRaises(TypeError, od1.update, 0, od1, 1)