polars.Expr.arg_unique#
- Expr.arg_unique() Expr [source]#
Get index of first unique value.
Examples
>>> df = pl.DataFrame( ... { ... "a": [8, 9, 10], ... "b": [None, 4, 4], ... } ... ) >>> df.select(pl.col("a").arg_unique()) shape: (3, 1) ┌─────┐ │ a │ │ --- │ │ u32 │ ╞═════╡ │ 0 │ │ 1 │ │ 2 │ └─────┘ >>> df.select(pl.col("b").arg_unique()) shape: (2, 1) ┌─────┐ │ b │ │ --- │ │ u32 │ ╞═════╡ │ 0 │ │ 1 │ └─────┘