def _read_args_from_files(self, arg_strings):
        # expand arguments referencing files
        new_arg_strings = []
        for arg_string in arg_strings:

            # for regular arguments, just add them back into the list
            if self.fromfile_prefix_chars not in arg_string[0]:
                new_arg_strings.append(arg_string)

            # replace arguments referencing files with the file content
            else:
                try:
                    args_file = open(arg_string[1:])
                    try:
                        arg_strings = []
                        for arg_line in args_file.read().splitlines():
                            for arg in self.convert_arg_line_to_args(arg_line):
                                arg_strings.append(arg)
                        arg_strings = self._read_args_from_files(arg_strings)
                        new_arg_strings.extend(arg_strings)
                    finally:
                        args_file.close()
                except IOError:
                    err = _sys.exc_info()[1]
                    self.error(str(err))

        # return the modified argument list
        return new_arg_strings
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/argparse/argparse.py/ArgumentParser._read_args_from_files/swapped operands of `not in`