test_querysetsequence.py 文件源码

def test_len(self):
        qss = self.all._clone()

        # Calling len() evaluates the QuerySet.
        self.assertEqual(len(qss), 5)
        self.assertIsNotNone(qss._result_cache)

        # Count should still work (and not hit the database) by using the cache.
        qss.query = None
        self.assertEqual(qss.count(), 5)