# beartype: Unbearably fast O(1) runtime type-checking in pure Python

<https://github.com/beartype/beartype>

- Host: [github.com](https://links.thingelstad.xyz/hosts/github.com/)
- Saved: November 23, 2021 (2021-11-24T01:23:25Z)
- Record: https://links.thingelstad.xyz/links/bfc2f66fdaca/
- JSON: https://links.thingelstad.xyz/links/bfc2f66fdaca.json

## What Jamie wrote

This looks like a powerful type-checker for Python.

> Beartype brings Rust- and C++-inspired zero-cost abstractions into the lawless world of dynamically-typed Python by enforcing type safety at the granular level of functions and methods against type hints standardized by the Python community in O(1) non-amortized worst-case time with negligible constant factors. 

Easy-to-use and claims to be extremely performant.

## Facts

- Kind: [Repository](https://links.thingelstad.xyz/kinds/repository/)
- Repository: beartype/beartype: Unbearably fast near-real-time pure-Python runtime-static type-checker.
- About the repository: Python, 3,508 stars, MIT, last push October 23, 2026
- Homepage: <https://beartype.readthedocs.io>

## Appears in

- [WT205: Weekly Thing #205 / Hurl, Faster, Web3](https://weekly.thingelstad.com/archive/205/), Notable

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## Elsewhere

- Wayback Machine: https://web.archive.org/web/*/https://github.com/beartype/beartype