polars.ones#

polars.ones(
n: int | Expr,
dtype: PolarsDataType = Float64,
*,
eager: Literal[False] = False,
) → Expr[source]#
polars.ones(n: int | Expr, dtype: PolarsDataType = Float64, *, eager: Literal[True]) → Series
polars.ones(n: int | Expr, dtype: PolarsDataType = Float64, *, eager: bool) → Expr | Series

Construct a column of length n filled with ones.

Syntactic sugar for repeat(1.0, ...).

Parameters:
n

Length of the resulting column.

dtype

Data type of the resulting column. Defaults to Float64.

eager

Evaluate immediately and return a Series. If set to False, return an expression instead.

See also

repeat
lit

Notes

If you want to construct a column in lazy mode and do not need a pre-determined length, use lit() instead.

Examples

>>> pl.ones(3, pl.Int8, eager=True)
shape: (3,)
Series: 'ones' [i8]
[
    1
    1
    1
]