bigframes.pandas.Series.add_prefix# Series.add_prefix(prefix: str, axis: int | str | None = None) → Series[source]# Prefix labels with string prefix. For Series, the row labels are prefixed. For DataFrame, the column labels are prefixed. Parameters: prefix (str) – The string to add before each label. axis (int or str or None, default None) – {{0 or 'index', 1 or 'columns', None}}, default None. Axis to add prefix on. Returns: New Series or DataFrame with updated labels. Return type: bigframes.pandas.DataFrame or bigframes.pandas.Series