polars.Series.cum_count

Series.cum_count(
    *,
    reverse: bool = False,
) → Self

Return the cumulative count of the non-null values in the column.

Parameters:

reverse

Reverse the operation.

Examples

>>> s = pl.Series(["x", "k", None, "d"])
>>> s.cum_count()
shape: (4,)
Series: '' [u32]
[
    1
    2
    2
    3
]