def set_spcPct(self, value):
        self._remove_spcPts()
        spcPct = self.get_or_add_spcPct()
        spcPct.val = value
Set spacing to *value* lines, e.g. 1.75 lines. A ./a:spcPts child is
dataset/ETHPy150Open scanny/python-pptx/pptx/oxml/text.py/CT_TextSpacing.set_spcPct