polars.Expr.unique#
- Expr.unique(*, maintain_order: bool = False) Expr [source]#
Get unique values of this expression.
- Parameters:
- maintain_order
Maintain order of data. This requires more work.
Examples
>>> df = pl.DataFrame({"a": [1, 1, 2]}) >>> df.select(pl.col("a").unique()) shape: (2, 1) ┌─────┐ │ a │ │ --- │ │ i64 │ ╞═════╡ │ 2 │ │ 1 │ └─────┘ >>> df.select(pl.col("a").unique(maintain_order=True)) shape: (2, 1) ┌─────┐ │ a │ │ --- │ │ i64 │ ╞═════╡ │ 1 │ │ 2 │ └─────┘