polars.Series.rle_id

Series.rle_id() → Series

Get a distinct integer ID for each run of identical values.

The ID starts at 0 and increases by one each time the value of the column changes.

Returns:

Series

Series of data type UInt32.

See also

rle

Notes

This functionality is especially useful for defining a new group for every time a column’s value changes, rather than for every distinct value of that column.

Examples

>>> s = pl.Series("s", [1, 1, 2, 1, None, 1, 3, 3])
>>> s.rle_id()
shape: (8,)
Series: 's' [u32]
[
    0
    0
    1
    2
    3
    4
    5
    5
]