polars.Series.list.count_matches#

Series.list.count_matches(element: IntoExpr) → Series[source]#

Count how often the value produced by element occurs.

Parameters:

element: An expression that produces a single value

Examples

>>> s = pl.Series("a", [[0], [1], [1, 2, 3, 2], [1, 2, 1], [4, 4]])
>>> s.list.count_matches(1)
shape: (5,)
Series: 'a' [u32]
[
    0
    1
    1
    2
    0
]