polars.Series.is_nan# Series.is_nan() → Series[source]# Returns a boolean Series indicating which values are NaN. Returns: SeriesSeries of data type Boolean. Examples >>> import numpy as np >>> s = pl.Series("a", [1.0, 2.0, 3.0, np.nan]) >>> s.is_nan() shape: (4,) Series: 'a' [bool] [ false false false true ]