polars.Expr.extend_constant#
- Expr.extend_constant(value: IntoExpr, n: int | IntoExprColumn) Expr [source]#
Extremely fast method for extending the Series with ‘n’ copies of a value.
- Parameters:
- value
A constant literal value or a unit expression with which to extend the expression result Series; can pass None to extend with nulls.
- n
The number of additional values that will be added.
Examples
>>> df = pl.DataFrame({"values": [1, 2, 3]}) >>> df.select((pl.col("values") - 1).extend_constant(99, n=2)) shape: (5, 1) ┌────────┐ │ values │ │ --- │ │ i64 │ ╞════════╡ │ 0 │ │ 1 │ │ 2 │ │ 99 │ │ 99 │ └────────┘