How to use the eccodes.codes_get_native_type function in eccodes

def get_values(self, descr_nr, autoget_cval=False):
        #  #[
        """
        request an array of values containing the values
        for a given descriptor number for all subsets
        NOTE: this may not work for templates using delayed replication.
        """
        if (self.msg_index == -1):
            raise NoMsgLoadedError

        list_of_names = self._get_abbr_names()
        keyname = list_of_names[descr_nr]
        print('keyname: ', keyname)
        s = eccodes.codes_get_size(self._bufr, keyname)
        t = eccodes.codes_get_native_type(self._bufr, keyname)
        print('key:', keyname, 'size = ', s, 'type = ', t)

        if s==1: # or t==str:
            # values = eccodes.codes_get_string(_bufr, keyname)
            values = [eccodes.codes_get(self._bufr, keyname),]
        else:
            values = eccodes.codes_get_array(self._bufr, keyname)

        return values
        #  #]