code: def _render_content(self, content, **settings):
          
          result = []
          bars = settings[self.SETTING_BARS]
  
          label_width = self.chart_measure(bars)
          if not settings[self.SETTING_BAR_WIDTH]:
              settings[self.SETTING_BAR_WIDTH] = TERMINAL_WIDTH - label_width - 3
          max_value = max(content)
          i = 0
          for bar in content:
              result.append(self._render_bar(bars[i], bar, max_value, label_width, **settings))
              i += 1
          return result
docs: Perform widget rendering, but do not print anything.