code: def style(self, style):
          
          if style is None:
              self._remove_rStyle()
          elif self.rStyle is None:
              self._add_rStyle(val=style)
          else:
              self.rStyle.val = style
docs: Set val attribute of <w:rStyle> child element to *style*, adding a
          new element if necessary. If *style* is |None|, remove the <w:rStyle>
          element if present.