polars.Series.apply#
- Series.apply(
- function: Callable[[Any], Any],
- return_dtype: PolarsDataType | None = None,
- *,
- skip_nulls: bool = True,
Apply a custom/user-defined function (UDF) over elements in this Series.
Deprecated since version 0.19.0: This method has been renamed to
Series.map_elements().- Parameters:
- function
Custom function or lambda.
- return_dtype
Output datatype. If none is given, the same datatype as this Series will be used.
- skip_nulls
Nulls will be skipped and not passed to the python function. This is faster because python can be skipped and because we call more specialized functions.