test_callbacks.py 文件源码

def test_pyobject(self):
        o = ()
        from sys import getrefcount as grc
        for o in (), [], object():
            initial = grc(o)
            # This call leaks a reference to 'o'...
            self.check_type(py_object, o)
            before = grc(o)
            # ...but this call doesn't leak any more.  Where is the refcount?
            self.check_type(py_object, o)
            after = grc(o)
            self.assertEqual((after, o), (before, o))