test_memoryview.py 文件源码

def test_weakref(self):
        # Check memoryviews are weakrefable
        for tp in self._types:
            b = tp(self._source)
            m = self._view(b)
            L = []
            def callback(wr, b=b):
                L.append(b)
            wr = weakref.ref(m, callback)
            self.assertIs(wr(), m)
            del m
            test.support.gc_collect()
            self.assertIs(wr(), None)
            self.assertIs(L[0], b)

# Variations on source objects for the buffer: bytes-like objects, then arrays
# with itemsize > 1.
# NOTE: support for multi-dimensional objects is unimplemented.