polars.lazyframe.group_by.LazyGroupBy.last#
- LazyGroupBy.last() LazyFrame [source]#
Aggregate the last values in the group.
Examples
>>> ldf = pl.DataFrame( ... { ... "a": [1, 2, 2, 3, 4, 5], ... "b": [0.5, 0.5, 4, 10, 14, 13], ... "c": [True, True, True, False, False, True], ... "d": ["Apple", "Orange", "Apple", "Apple", "Banana", "Banana"], ... } ... ).lazy() >>> ldf.group_by("d", maintain_order=True).last().collect() shape: (3, 4) ┌────────┬─────┬──────┬───────┐ │ d ┆ a ┆ b ┆ c │ │ --- ┆ --- ┆ --- ┆ --- │ │ str ┆ i64 ┆ f64 ┆ bool │ ╞════════╪═════╪══════╪═══════╡ │ Apple ┆ 3 ┆ 10.0 ┆ false │ │ Orange ┆ 2 ┆ 0.5 ┆ true │ │ Banana ┆ 5 ┆ 13.0 ┆ true │ └────────┴─────┴──────┴───────┘