test_memoryview.py 文件源码

def test_gc(self):
        for tp in self._types:
            if not isinstance(tp, type):
                # If tp is a factory rather than a plain type, skip
                continue

            class MySource(tp):
                pass
            class MyObject:
                pass

            # Create a reference cycle through a memoryview object
            b = MySource(tp(b'abc'))
            m = self._view(b)
            o = MyObject()
            b.m = m
            b.o = o
            wr = weakref.ref(o)
            b = m = o = None
            # The cycle must be broken
            gc.collect()
            self.assertTrue(wr() is None, wr())