code: def _render_content(self, content, **settings):
          
          bar_len = int(settings[self.SETTING_BAR_WIDTH])
          if not bar_len:
              bar_len = TERMINAL_WIDTH - 10
          percent = content
          progress = ""
          progress += str(settings[self.SETTING_BAR_CHAR]) * int(bar_len * percent)
          s = {k: settings[k] for k in (self.SETTING_FLAG_PLAIN,)}
          s.update(settings[self.SETTING_BAR_FORMATING])
          progress = self.fmt_text(progress, **s)
          progress += ' ' * int(bar_len - int(bar_len * percent))
          return "{:6.2f}% [{:s}]".format(percent * 100, progress)
docs: Perform widget rendering, but do not print anything.