test_memoryview.py 文件源码

def test_issue22668(self):
        a = array.array('H', [256, 256, 256, 256])
        x = memoryview(a)
        m = x.cast('B')
        b = m.cast('H')
        c = b[0:2]
        d = memoryview(b)

        del b

        self.assertEqual(c[0], 256)
        self.assertEqual(d[0], 256)
        self.assertEqual(c.format, "H")
        self.assertEqual(d.format, "H")

        _ = m.cast('I')
        self.assertEqual(c[0], 256)
        self.assertEqual(d[0], 256)
        self.assertEqual(c.format, "H")
        self.assertEqual(d.format, "H")


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