polars.Series.arr.n_unique

Series.arr.n_unique() → Series

Count the number of unique values in every sub-arrays.

Examples

>>> s = pl.Series("a", [[1, 2], [4, 4]], dtype=pl.Array(pl.Int64, 2))
>>> s.arr.n_unique()
shape: (2,)
Series: 'a' [u32]
[
    2
    1
]