polars.Expr.extend_constant

Expr.extend_constant(
    value: IntoExpr,
    n: int | IntoExprColumn,
) → Expr

Extremely fast method for extending the Series with ‘n’ copies of a value.

engine:In Memory

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     │
└────────┘