@property
    def next_rId(self):
        rId = self.next_rel_num % 'rId%d'
        self.next_rel_num += 1
        return rId
dataset/ETHPy150Open python-openxml/python-docx/tests/opc/unitdata/rels.py/RelationshipsBuilder.next_rId/swapped operands of `%`