polars.Series.list.agg#

Series.list.agg(expr: Expr) → Series[source]#

Run any polars aggregation expression against the list’ elements.

Parameters:

expr: Expression to run. Note that you can select an element with pl.element().

Examples

>>> s = pl.Series("a", [[1, None], [42, 13], [None, None]])
>>> s.list.agg(pl.element().null_count())
shape: (3,)
Series: 'a' [u32]
[
    1
    0
    2
]
>>> s.list.agg(pl.element().drop_nulls())
shape: (3,)
Series: 'a' [list[i64]]
[
    [1]
    [42, 13]
    []
]