docs: def colorize(txt, fg=None, bg=None):
      """
      Print escape codes to set the terminal color.
  
      fg and bg are indices into the color palette for the foreground and
      background colors.
      """
  
      setting = ''
      setting += _SET_FG.format(fg) if fg else ''
      setting += _SET_BG.format(bg) if bg else ''
      return setting + str(txt) + _STYLE_RESET