code: def askopenfile(mode="r", **options):
      "Ask for a filename to open, and returned the opened file"
  
      filename = askopenfilename(**options)
      if filename:
          return open(filename, mode)
      return Nonf askopenfile(mode="r", **options):
      "Ask for a filename to open, and returned the opened file"
  
      filename = askopenfilename(**options)
      if filename:
          return open(filename, mode)
      return None
docs: Ask for a filename to open, and returned the opened file