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

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)]