polars.last#

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

Get the last column or value.

This function has different behavior depending on the presence of columns values. If none given (the default), returns an expression that takes the last column of the context; otherwise, takes the last value of the given column(s).

Parameters:

*columns: One or more column names.

Examples

>>> df = pl.DataFrame(
...     {
...         "a": [1, 8, 3],
...         "b": [4, 5, 2],
...         "c": ["foo", "bar", "baz"],
...     }
... )

Return the last column:

>>> df.select(pl.last())
shape: (3, 1)
┌─────┐
│ c   │
│ --- │
│ str │
╞═════╡
│ foo │
│ bar │
│ baz │
└─────┘

Return the last value for the given column(s):

>>> 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 │
└─────┴─────┘