code: def style(self, style):
          
          if style is None:
              self._remove_pStyle()
              return
          pStyle = self.get_or_add_pStyle()
          pStyle.val = style
docs: Set val attribute of <w:pStyle> child element to *style*, adding a
          new element if necessary. If *style* is |None|, remove the <w:pStyle>
          element if present.