narwhals.Series.list
len() -> SeriesT
Return the number of elements in each list.
Null values count towards the total.
Returns:
Type | Description |
---|---|
SeriesT
|
A new series. |
Examples:
>>> import pyarrow as pa
>>> import narwhals as nw
>>> s_native = pa.chunked_array([[[1, 2], [3, 4, None], None, []]])
>>> s = nw.from_native(s_native, series_only=True)
>>> s.list.len().to_native()
<pyarrow.lib.ChunkedArray object at ...>
[
[
2,
3,
null,
0
]
]