WebbA Grouper allows the user to specify a groupby instruction for an object. This specification will select a column via the key parameter, or if the level and/or axis parameters are given, a level of the index of the target object. If axis and/or level are passed as keywords to both Grouper and groupby, the values passed to Grouper take precedence. WebbOne of the most efficient ways to process tabular data is to parallelize its processing via the "split-apply-combine" approach. This operation is at the core of the Polars grouping implementation, allowing it to attain lightning-fast operations. Specifically, both the "split" and "apply" phases are executed in a multi-threaded fashion.
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GroupBy - Polars - User Guide - GitHub Pages
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