# Lark parser library for Python

6 Hacker News commenters recommended Lark parser library for Python and 1 criticized it, November 2025 to November 2026. It was recommended in 5 of 13 months.

**Verdict:** A Python parsing library that people recommend for quickly experimenting with grammars and syntax. Critics report that after a while they went back to plain Python, which they found faster.

## Why people recommend it

- Fast iteration on grammar syntax (2 comments): "the speed of experimenting with different syntax/grammars is just insane" ([source](https://news.ycombinator.com/item?id=46216457)) "so you can iterate fast and get a runtime spec of your grammar" ([source](https://news.ycombinator.com/item?id=47778414))

## Alternatives hackers recommend

- [Tree-sitter](https://hackerapproved.com/p/tree-sitter.md): 79 recommend
- [Hardwood Parquet parser](https://hackerapproved.com/p/hardwood.md): 7 recommend
- [Kaitai Struct](https://hackerapproved.com/p/kaitai-struct.md): 6 recommend
- [Ohm parsing library](https://hackerapproved.com/p/ohm.md): 6 recommend
- [nom Rust parser library](https://hackerapproved.com/p/nom.md): 5 recommend

## Cite as

Hacker Approved, "Lark parser library for Python", https://hackerapproved.com/p/lark/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).