test_gc.py 文件源码

def test_boom_new(self):
        # boom__new and boom2_new are exactly like boom and boom2, except use
        # new-style classes.

        class Boom_New(object):
            def __getattr__(self, someattribute):
                del self.attr
                raise AttributeError

        a = Boom_New()
        b = Boom_New()
        a.attr = b
        b.attr = a

        gc.collect()
        garbagelen = len(gc.garbage)
        del a, b
        self.assertEqual(gc.collect(), 4)
        self.assertEqual(len(gc.garbage), garbagelen)