Load arguments prefixed with '@' from file as string

        :param args: Arguments passed from command line
        :type args: list

def _expand_prefixed_files(args):
        """ Load arguments prefixed with '@' from file as string

        :param args: Arguments passed from command line
        :type args: list
        """
        for arg, _ in enumerate(args):
            if args[arg].startswith('@'):
                try:
                    logger.debug('Attempting to read file %s', args[arg][1:])
                    with open(args[arg][1:], 'r') as f:
                        content = f.read()
                    args[arg] = content
                except IOError:
                    # Leave arg unmodified
                    logger.debug('File Error: Failed to open %s, assume not a file', args[arg][1:])
        return args