@property
    def _styles_part(self):
        try:
            return self.part_related_by(RT.STYLES)
        except KeyError:
            styles_part = StylesPart.default(self.package)
            self.relate_to(styles_part, RT.STYLES)
            return styles_part
Instance of |StylesPart| for this document. Creates an empty styles
dataset/ETHPy150Open python-openxml/python-docx/docx/parts/document.py/DocumentPart._styles_part