#199: Charlie Marsh on ty, uv, and the Python tooling renaissance

Pybites Podcast

Charlie Marsh returns to Pybites to introduce ty —Astral’s bold new take on Python type checking. Built from the ground up for speed and developer experience, ty is both a command-line tool and language server, powered by Rust's Salsa framework.

We dive into how it enables lightning-fast incremental analysis, smarter diagnostics inspired by Rust, and a reimagined type-checking workflow for modern Python projects. Charlie also shares how Astral is tackling broader ecosystem challenges alongside Meta and NVIDIA.

Curious? Just run 'uv x ty' and join the future of Python type checking.

For more info check out the following:

Notes & Blog Posts: https://notes.crmarsh.com/

LinkedIn: https://www.linkedin.com/in/marshcharles/

GitHub: https://github.com/charliermarsh

X: https://x.com/charliermarsh

GitHub Repo: https://github.com/astral-sh/ty

Explaining rust-analyzer (lectures): https://www.youtube.com/playlist?list=PLhb66M_x9UmrqXhQuIpWC5VgTdrGxMx3y

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บท

1. TY's Advanced Incrementality Model (00:00:00)

2. Introduction to the PyBytes Podcast (00:00:22)

3. Catching Up with Charlie Marsh (00:00:41)

4. UV's New Build System (00:03:17)

5. Hardware Acceleration in Python Packaging (00:05:27)

6. Introducing TY: Type Checker & Language Server (00:10:32)

7. Performance Architecture and Incrementality (00:17:23)

8. Error Messages and Helpful Diagnostics (00:30:03)

9. Evolving with Python's Type System (00:35:18)

10. Future of Ruff and TY Integration (00:42:11)

11. TY Adoption and Design Philosophy (00:50:34)

12. Final Thoughts and Team Recognition (00:52:41)