@property
    def base_style(self):
        basedOn = self.basedOn
        if basedOn is None:
            return None
        styles = self.getparent()
        base_style = styles.get_by_id(basedOn.val)
        if base_style is None:
            return None
        return base_style
Sibling CT_Style element this style is based on or |None| if no base
dataset/ETHPy150Open python-openxml/python-docx/docx/oxml/styles.py/CT_Style.base_style