def part_related_by(self, reltype):
        return self.rels.part_with_reltype(reltype)
converts a statement in string form to tokens and passes off to
dataset/ETHPy150Open python-openxml/python-docx/docx/opc/package.py/OpcPackage.part_related_by--crossover with--dataset/ETHPy150Open keeganmccallum/sql4pandas/sql4pandas/sqlparser.py/SQLParser.parse_statement