polars.internals.expr.ExprListNameSpace.get¶
- ExprListNameSpace.get(index: int) polars.internals.expr.Expr¶
Get the value by index in the sublists. So index 0 would return the first item of every sublist and index -1 would return the last item of every sublist if an index is out of bounds, it will return a None.
- Parameters
- index
Index to return per sublist
Examples
>>> df = pl.DataFrame({"foo": [[3, 2, 1], [], [1, 2]]}) >>> df.select(pl.col("foo").arr.get(0)) shape: (3, 1) ┌──────┐ │ foo │ │ --- │ │ i64 │ ╞══════╡ │ 3 │ ├╌╌╌╌╌╌┤ │ null │ ├╌╌╌╌╌╌┤ │ 1 │ └──────┘