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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):
 """Main command-line interface entrypoint. Runs the given subcommand or argument that were specified. If not given a ``args`` parameter, assumes the arguments are passed on the command-line. Args: args (list):
 list of command-line arguments Returns: Zero on success, non-zero otherwise. """

    if args is None:
        args = sys.argv[1:]

    parser = create_parser()
    args = parser.parse_args(args)

    if args.verbose >= 2:
        level = logging.DEBUG
    elif args.verbose >= 1:
        level = logging.INFO
    else:
        level = logging.WARNING

    logging.basicConfig(level=level)

    try:
        args.command(args)
    except pylink.JLinkException as e:
        sys.stderr.write('Error: %s%s' % (str(e), os.linesep))
        return 1

    return 0