Horizontal Aggregation in Polars: The fold() Expression

· · July 13, 2026, 2:03 p.m.
Data Science polars 2026 fold polars Data Aggregation Python data-processing
Summary
This post discusses the fold() expression in the Polars library, which allows for horizontal aggregation of data by summing across columns, providing a novel approach compared to standard vertical aggregations in data handling.
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