polars.Series.arr.join#

Series.arr.join(separator: IntoExprColumn, *, ignore_nulls: bool = True) → Series[source]#

Join all string items in a sub-array and place a separator between them.

This errors if inner type of array != String.

Parameters:

separator

string to separate the items with

ignore_nulls

Ignore null values (default).

If set to False, null values will be propagated. If the sub-list contains any null values, the output is None.

Returns:

Series: Series of data type String.

Examples

>>> s = pl.Series([["x", "y"], ["a", "b"]], dtype=pl.Array(pl.String, 2))
>>> s.arr.join(separator="-")
shape: (2,)
Series: '' [str]
[
    "x-y"
    "a-b"
]