How to use the pgspecial.namedqueries.NamedQueries.instance.get function in pgspecial

def execute_named_query(cur, pattern, **_):
    """Returns (title, rows, headers, status)"""
    if pattern == '':
        return list_named_queries(True)

    params = shlex.split(pattern)
    pattern = params.pop(0)

    query = NamedQueries.instance.get(pattern)
    title = '> {}'.format(query)
    if query is None:
        message = "No named query: {}".format(pattern)
        return [(None, None, None, message)]

    try:
        if "$1" in query:
            query, params = subst_favorite_query_args(query, params)
            if query is None:
                raise Exception("Bad arguments\n" + params)
        cur.execute(query)
    except psycopg2.ProgrammingError as e:
        if e.pgcode == psycopg2.errorcodes.SYNTAX_ERROR and "%s" in query:
            raise Exception('Bad arguments: '
                            'please use "$1", "$2", etc. for named queries instead of "%s"')
        else:

def list_named_queries(verbose):
    """List of all named queries.
    Returns (title, rows, headers, status)"""
    if not verbose:
        rows = [[r] for r in NamedQueries.instance.list()]
        headers = ["Name"]
    else:
        headers = ["Name", "Query"]
        rows = [[r, NamedQueries.instance.get(r)]
                for r in NamedQueries.instance.list()]

    if not rows:
        status = NamedQueries.instance.usage
    else:
        status = ''
    return [('', rows, headers, status)]