pyright

Project Overview

Pyright is a full-featured, standards-based static type checker for Python from Microsoft, built for high performance on large Python source bases. It ships as both a command-line tool and a VS Code extension, and powers the Pylance language service. A weekly type-checker benchmark makes performance comparisons with other tools transparent.

High-performance type checking built for large Python codebases.

Key Features

• Static type checking: comprehensive checks based on standard type annotations
• High performance: optimized for large source bases with fast checks
• Command-line tool: integrates into CI pipelines for type checking
• VS Code extension: real-time type diagnostics inside the editor
• Online Playground: try and verify type behavior in the browser
• Transparent benchmarks: weekly performance comparisons against other checkers

Target Audience

• Python developers
• Large project maintainers
• CI pipeline maintainers
• VS Code users
• Teams rolling out type annotations

Quick Start

1. Install Pyright

pip install pyright

2. Check your project

pyright

3. Or install the Pyright extension in VS Code for real-time diagnostics

4. Try it quickly in the browser with the official Playground

Core Advantages

• Large-codebase friendly: designed for big source bases with stable performance
• Standards based: predictable behavior built on type annotation standards
• Ecosystem standing: the foundation of Pylance in VS Code with a mature community

System Requirements

Notes

• Temp directory: in restricted environments set PYRIGHT_TMPDIR to override the temp root
• Pyright vs Pylance: core type checking belongs to Pyright; language service features to Pylance
• Docs first: installation, configuration, and usage details follow the official documentation