Method __buffer__

Lib/test/test_io/test_memoryio.py:592–594

(self, flags)

    def test_write_concurrent_close(self):
        class B:
            def __buffer__(self, flags):
                memio.close()
                return memoryview(b"A")

        memio = self.ioclass()
        self.assertRaises(ValueError, memio.write, B())