polars.last — Polars documentation (original) (raw)

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

Get the last column or value.

This function has different behavior depending on the presence of columnsvalues. 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 │ └─────┴─────┘