Pyright

Judgement

What it is

Developer tool

What it does

A standards-based static type checker for Python, available as a command-line tool and as the engine behind VS Code's Pylance extension.

Adopt it when

You want a fast, strict and spec-complete type checker for Python, especially in VS Code.

Watch out

Some of its best editor features live in the closed-source Pylance, and it runs on Node.js.

Ready for

Production-ready

Runs as

Command line

Built with

TypeScript and Node.js

How established

Established: started 7 years ago, latest release 1.1.414.

What the license allows

GitHub could not read the license. Check it in the repository before reusing any code.

Judged on 2026-11-06 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

Follow it down: Pyright → CPython → GCC → LLVM project → runs on a microchip

How compilers were built, back to punched paper tape

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