polars.Series.str.split_exact#

Series.str.split_exact(by: str, n: int, *, inclusive: bool = False) → Series[source]#

Split the string by a substring using n splits.

Results in a struct of n+1 fields.

If it cannot make n splits, the remaining field elements will be null.

Parameters:

by: Substring to split by.
n: Number of splits to make.
inclusive: If True, include the split character/string in the results.

Returns:

Series: Series of data type Struct with fields of data type Utf8.

Examples

>>> df = pl.DataFrame({"x": ["a_1", None, "c", "d_4"]})
>>> df["x"].str.split_exact("_", 1).alias("fields")
shape: (4,)
Series: 'fields' [struct[2]]
[
        {"a","1"}
        {null,null}
        {"c",null}
        {"d","4"}
]

Split string values in column x in exactly 2 parts and assign each part to a new column.

>>> (
...     df["x"]
...     .str.split_exact("_", 1)
...     .struct.rename_fields(["first_part", "second_part"])
...     .alias("fields")
...     .to_frame()
...     .unnest("fields")
... )
shape: (4, 2)
┌────────────┬─────────────┐
│ first_part ┆ second_part │
│ ---        ┆ ---         │
│ str        ┆ str         │
╞════════════╪═════════════╡
│ a          ┆ 1           │
│ null       ┆ null        │
│ c          ┆ null        │
│ d          ┆ 4           │
└────────────┴─────────────┘