code: def add_noFill_bgPr(self):
          
          xml = (
              '<p:bgPr %s>\n'
              '  <a:noFill/>\n'
              '  <a:effectLst/>\n'
              '</p:bgPr>' % nsdecls('a', 'p')
          )
          bgPr = parse_xml(xml)
          self._insert_bgPr(bgPr)
          return bgPr
docs: Return a new `p:bgPr` element with noFill properties.