# Polars

> Polars lightning-fast DataFrame library reference. Rust-powered, 10-100x faster than Pandas. Covers expressions, lazy evaluation with query optimization, window functions, string/date operations, group-by, joins, SQL interface, and streaming for large data.

- Skill: `bytesagain/polars` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add bytesagain/polars`
- Raw SKILL.md: https://api.skillmd.com/api/skills/bytesagain/polars/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Data & Analytics
- Author: bytesagain (https://skillmd.com/u/bytesagain)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/bytesagain/polars

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# Polars Reference

Lightning-fast DataFrame library.

## Commands

| Command | Description |
|---------|-------------|
| `intro` | Overview, Pandas comparison |
| `basics` | Create, filter, group, join |
| `advanced` | Lazy eval, windows, SQL, streaming |