code: def _add_include_arg(arg_parser):
      
      arg_parser.add_argument("--include",
                              metavar='Path',
                              action='append',
                              type=to_unicode,
                              dest='include_paths',
                              help="Specifies a single path to include. This argument can be repeated.",
                              default=[])
docs: Adds optional repeatable include parameter to a parser.
      :param arg_parser: ArgumentParser parser to add this argument to.