polars.last#

polars.last(*columns: str) → Expr[source]#

Get the last value.

This function has different behavior depending on the input type:

None -> Takes last column of a context (equivalent to cs.last()).
str or [str,] -> Syntactic sugar for pl.col(columns).last().

Parameters:

*columns: One or more column names. If set to None (default), returns an expression to take the last column of the context instead.

Examples

>>> df = pl.DataFrame(
...     {
...         "a": [1, 8, 3],
...         "b": [4, 5, 2],
...         "c": ["foo", "bar", "baz"],
...     }
... )
>>> df.select(pl.last())
shape: (3, 1)
┌─────┐
│ c   │
│ --- │
│ str │
╞═════╡
│ foo │
│ bar │
│ baz │
└─────┘
>>> df.select(pl.last("a"))
shape: (1, 1)
┌─────┐
│ a   │
│ --- │
│ i64 │
╞═════╡
│ 3   │
└─────┘
>>> df.select(pl.last("b", "c"))
shape: (1, 2)
┌─────┬─────┐
│ b   ┆ c   │
│ --- ┆ --- │
│ i64 ┆ str │
╞═════╪═════╡
│ 2   ┆ baz │
└─────┴─────┘