polars.arg_where¶
- polars.arg_where(mask: polars.internals.series.Series) polars.internals.series.Series¶
Get index values where Boolean mask evaluate True.
- Parameters
- mask
Boolean Series.
- Returns
- UInt32 Series
Examples
>>> df = pl.DataFrame({"a": [1, 2, 3, 4, 5]}) >>> pl.arg_where(df.select(pl.col("a") % 2 == 0).to_series()) shape: (2,) Series: '' [u32] [ 1 3 ]