Polars

Overview

Polars is a lightning-fast DataFrame library for Python and Rust built on Apache Arrow. Work with Polars' expression-based API, lazy evaluation framework, and high-performance data manipulation capabilities for efficient data processing, pandas migration, and data pipeline optimization.

When to Use This Skill

• pandas code is too slow but the data (or the columns a lazy query touches) fits on one machine
• Building ETL or feature pipelines with lazy scans (scan_csv, scan_parquet) and query optimization
• Migrating pandas code to the Polars expression API
• Window functions, joins, and group-by aggregations over large in-memory tables

Does NOT Trigger