Web Reference: Polars expressions are quite powerful and flexible, so there is much less need for custom Python functions compared to other libraries. Still, you may need to pass an expression's state to a third party library or apply your black box function to data in Polars. Mar 29, 2022 · The first step would be to check if your task can be solved natively using Polars Expressions. If a custom function is neccessary, .map_elements() can be used to apply one on a row by row basis. Using custom functions is sometimes necessary when processing data. polars allows one to chain many expressions, thus making it possible to create custom functions that benefit from all its optimizations, such as parallelism and streaming mode.
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