polars.Expr.is_duplicated#
- Expr.is_duplicated() Expr [source]#
Return a boolean mask indicating duplicated values.
- Returns:
- Expr
Expression of data type
Boolean
.
Examples
>>> df = pl.DataFrame({"a": [1, 1, 2]}) >>> df.select(pl.col("a").is_duplicated()) shape: (3, 1) ┌───────┐ │ a │ │ --- │ │ bool │ ╞═══════╡ │ true │ │ true │ │ false │ └───────┘