How to use the vcstool.streams.set_streams function in vcstool

def main(args=None, stdout=None, stderr=None):
    set_streams(stdout=stdout, stderr=stderr)

    parser = get_parser()
    add_common_arguments(parser, skip_hide_empty=True, path_nargs='?')
    args = parser.parse_args(args)

    command = ExportCommand(args)
    clients = find_repositories(command.paths, nested=command.nested)
    if command.output_repos:
        output_repositories(clients)
    jobs = generate_jobs(clients, command)
    results = execute_jobs(jobs, number_of_workers=args.workers)

    # check if at least one repo was found in the client directory
    basename = None
    for result in results:
        result['path'] = get_relative_path_of_result(result)

def main(args=None, stdout=None, stderr=None):
    set_streams(stdout=stdout, stderr=stderr)

    parser = get_parser()
    add_common_arguments(parser)

    # separate anything followed after --args to not confuse argparse
    if args is None:
        args = sys.argv[1:]
    try:
        index = args.index('--args') + 1
    except ValueError:
        # should generate error due to missing --args
        parser.parse_known_args(args)

    client_args = args[index:]
    args = parser.parse_args(args[0:index])
    args.args = client_args

def main(args=None, stdout=None, stderr=None):
    set_streams(stdout=stdout, stderr=stderr)

    parser = get_parser()
    add_common_arguments(
        parser, skip_hide_empty=True, skip_nested=True, path_nargs='?',
        path_help='Base path to clone repositories to')
    args = parser.parse_args(args)
    try:
        repos = get_repositories(args.input)
    except RuntimeError as e:
        print(ansi('redf') + str(e) + ansi('reset'), file=sys.stderr)
        return 1
    jobs = generate_jobs(repos, args)
    add_dependencies(jobs)

    if args.repos:
        output_repositories([job['client'] for job in jobs])

def main(args=None, stdout=None, stderr=None):
    set_streams(stdout=stdout, stderr=stderr)

    # no help to extract command first (which might be followed by --help)
    parser = get_parser(add_help=False)
    ns, _ = parser.parse_known_args(args)

    # help for a specific command
    if ns.command:
        # relay help request foe specific command
        entrypoint = get_entrypoint(ns.command)
        if not entrypoint:
            return 1
        return entrypoint(['--help'])

    # regular parsing validating options and arguments
    parser = get_parser()
    ns = parser.parse_args(args)