polars.Expr.rle

Expr.rle() → Self

Get the lengths of runs of identical values.

Returns:

Expr

Expression of data type Struct with Fields “lengths” and “values”.

Examples

>>> df = pl.DataFrame(pl.Series("s", [1, 1, 2, 1, None, 1, 3, 3]))
>>> df.select(pl.col("s").rle()).unnest("s")
shape: (6, 2)
┌─────────┬────────┐
│ lengths ┆ values │
│ ---     ┆ ---    │
│ i32     ┆ i64    │
╞═════════╪════════╡
│ 2       ┆ 1      │
│ 1       ┆ 2      │
│ 1       ┆ 1      │
│ 1       ┆ null   │
│ 1       ┆ 1      │
│ 2       ┆ 3      │
└─────────┴────────┘