code: def highlight(code, lexer, formatter, outfile=None):
      """
      This is the most high-level highlighting function. It combines `lex` and
      `format` in one function.
      """
      return format(lex(code, lexer), formatter, outfile)
  
imports: from io import StringIO, BytesIO
label_desc: Use image node_id 3 for calling a global function with example usage: highlight(code, lexer, formatter, outfile) and returns: format