code: def get_parser():
      
      parser = argparse.ArgumentParser()
      parser.add_argument(
          "package",
          choices=arg_map.keys(),
          help="designates the package to test")
      parser.add_argument("--ignore", help="ignore these files")
      return parser
docs: Generate an appropriate parser.
  
      :returns: an argument parser
      :rtype: `ArgumentParser`