@property
    def defRPr(self):
        p = self.p_lst[0]
        pPr = p.get_or_add_pPr()
        defRPr = pPr.get_or_add_defRPr()
        return defRPr
``<a:defRPr>`` element of required first ``p`` child, added with its
dataset/ETHPy150Open scanny/python-pptx/pptx/oxml/text.py/CT_TextBody.defRPr