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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def main(args=None):
 """CLI main function. Parameters args : `list` of `str`, optional CLI arguments (default: `sys.argv`). """

    parser = ArgumentParser()
    parser.add_argument('-v', '--version',
                        action='version', version=CLI_VERSION)

    parsers = parser.add_subparsers(dest='dtype')

    text.create_arg_parser(parsers.add_parser('text'))
    if image is not None:
        image.create_arg_parser(parsers.add_parser('image'))

    if len(sys.argv if args is None else args) <= 1:
        parser.print_help()
        sys.exit(1)

    args = parser.parse_args(args)
    dtype = globals()[args.dtype]
    try:
        set_args(args)
        cmd = getattr(dtype, 'cmd_' + args.command)
        cmd(args)
    except ValueError as err:
        print(str(err), file=sys.stderr)
        sys.exit(1)