def assembly_formatstring(self, partition_lengths, delimiter):
        if len(partition_lengths) == 1:
            return partition_lengths[0] % _('%d digits')
        else:
            return delimiter.join('n' * l for l in partition_lengths)
dataset/ETHPy150Open formencode/formencode/formencode/national.py/DelimitedDigitsPostalCode.assembly_formatstring/swapped operands of `%`