code: def banner(message, width=30, style='banner', out=sys.stdout):
      
      out.write(header([message], width=max(width, len(message)), style=style) + '\n')
      out.flush()
docs: Prints a banner message
  
      Parameters
      ----------
      message : string
          The message to print in the banner
  
      width : int
          The minimum width of the banner (Default: 30)
  
      style : string
          A line formatting style (Default: 'banner')
  
      out : writer
          An object that has write() and flush() methods (Default: sys.stdout)