@property
    def _core_properties_part(self):
        """
        |CorePropertiesPart| object related to this package. Creates
        a default core properties part if one is not present (not common).
        """
        try:
            return self.part_related_by(RT.CORE_PROPERTIES)
        except __HOLE__:
            core_properties_part = CorePropertiesPart.default(self)
            self.relate_to(core_properties_part, RT.CORE_PROPERTIES)
            return core_properties_part
dataset/ETHPy150Open python-openxml/python-docx/docx/opc/package.py/OpcPackage._core_properties_part