code: def add_run(self, text=None, style=None):
          
          r = self._p.add_r()
          run = Run(r, self)
          if text:
              run.text = text
          if style:
              run.style = style
          return run
docs: Append a run to this paragraph containing *text* and having character
          style identified by style ID *style*. *text* can contain tab
          (``\\t``) characters, which are converted to the appropriate XML form
          for a tab. *text* can also include newline (``\\n``) or carriage
          return (``\\r``) characters, each of which is converted to a line
          break.