How to use the cellbrowser.lineFileNextRow function in cellbrowser

def parseClustersFromMeta(metaFname, clusterFieldName, fixDot):
    " parse cluster -> cellId assignment from meta file, return as dict clusterName -> list of cellIds "
    logging.info("Parsing and using first field as the cell ID in file %s" % metaFname)
    clusterToCells = defaultdict(list)
    metaCellIds = set()
    skipCount = 0
    for row in cellbrowser.lineFileNextRow(metaFname):
        clusterName = row._asdict()[clusterFieldName]
        cellId = row[0]
        if fixDot:
            cellId = cellId.replace(".", "-")

        # skip all cells assigned to the "" cluster
        if clusterName=="":
            skipCount +=1
            continue

        if cellId in metaCellIds:
            errAbort("duplicated cell ID %s in meta data" % cellId)

        metaCellIds.add(cellId)
        clusterToCells[clusterName].append(cellId)