def _append_bytes(self, value, _file):  # pylint: disable=no-self-use
        """Call this function to write bytes contents.

        Keyword arguments:
            * value - dict, content to be dumped
            * _file - FileIO, output file

        """
        # binascii.b2a_base64(value) -> plistlib.Data
        # binascii.a2b_base64(Data) -> value(bytes)

        _text = ' '.join(textwrap.wrap(value.hex(), 2))
        # _data = [H for H in iter(
        #         functools.partial(io.StringIO(value.hex()).read, 2), '')
        #         ]  # to split bytes string into length-2 hex string list
        _labs = ' "{text}"'.format(text=_text)
        _file.write(_labs)