code: def set_style(self, style):
          
          if style == "none":
              self.style = None
          elif prompt_toolkit is None:
              raise CoconutException("syntax highlighting is not supported on this Python version")
          elif style == "list":
              print("Coconut Styles: none, " + ", ".join(pygments.styles.get_all_styles()))
              sys.exit(0)
          elif style in pygments.styles.get_all_styles():
              self.style = style
          else:
              raise CoconutException("unrecognized pygments style", style, extra="use '--style list' to show all valid styles")
docs: Set pygments syntax highlighting style.