polars.Series.list.n_unique

Series.list.n_unique() → Series

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

Examples

>>> s = pl.Series("a", [[1, 1, 2], [2, 3, 4]])
>>> s.list.n_unique()
shape: (2,)
Series: 'a' [u32]
[
    2
    3
]