polars.n_unique#
- polars.n_unique(column: str) Expr [source]#
- polars.n_unique(column: Series) int
Count unique values.
Examples
>>> df = pl.DataFrame({"a": [1, 8, 1], "b": [4, 5, 2], "c": ["foo", "bar", "foo"]}) >>> df.select(pl.n_unique("a")) shape: (1, 1) ┌─────┐ │ a │ │ --- │ │ u32 │ ╞═════╡ │ 2 │ └─────┘ >>> pl.n_unique(df["a"]) 2