Horizontal Aggregation in Polars: The fold() Expression

· Ahmed Nabil · July 13, 2026, 2:24 p.m.
Data Science polars 2026 fold polars Data Aggregation programming Python
Summary
This blog post discusses the `fold()` expression in Polars, which allows for horizontal aggregations—summing values across multiple columns—rather than the standard vertical aggregations. The content is geared towards developers familiar with Polars and Python data manipulation.
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