polars.Expr.lt#

Expr.lt(other: Any) → Self[source]#

Method equivalent of “less than” operator expr < other.

Parameters:

other: A literal or expression value to compare with.

Examples

>>> df = pl.DataFrame(
...     data={
...         "x": [1.0, 2.0, float("nan"), 3.0],
...         "y": [2.0, 2.0, float("nan"), 4.0],
...     }
... )
>>> df.with_columns(
...     pl.col("x").lt(pl.col("y")).alias("x < y"),
... )
shape: (4, 3)
┌─────┬─────┬───────┐
│ x   ┆ y   ┆ x < y │
│ --- ┆ --- ┆ ---   │
│ f64 ┆ f64 ┆ bool  │
╞═════╪═════╪═══════╡
│ 1.0 ┆ 2.0 ┆ true  │
│ 2.0 ┆ 2.0 ┆ false │
│ NaN ┆ NaN ┆ false │
│ 3.0 ┆ 4.0 ┆ true  │
└─────┴─────┴───────┘