March 2026 update of The Diff & The Merge, my substack about OS maintenance. oxykodit.substack.com/p/march-2026... - free-threaded Python in FastAPI - ty as type checker - triaging nanochat PRs - nanochat's little brother "autoresearch" - publishing LLM-readable skills files

All my Python projects are now using ty for type checks 🎉 @fastapi.tiangolo.com, Typer, SQLModel, Asyncer, etc. Thank you @oxykodit.bsky.social 🙌 ty is great, try it docs.astral.sh/ty/

Here's SQLModel 0.0.38 🍫 🐛 @carljm.me from the Astral team implemented a typing fix to improve correctness and compatibility with the next ty 🙌 sqlmodel.tiangolo.com

Now @fastapi.tiangolo.com is a fully AI agentic framework. This is the future. 🚀 Thank you alejsdev, @patrick.wtf, malvex 🙌

Some universities in at least two countries are asking students to get a CVE number assigned in an open source project to verify their academic results. Please don't do this, completely wrong incentive. This damages open source. It's a DDoS attack on maintainer attention.

Quality PR reviews I receive 🤓

If the Python core team started a weekly/monthly newsletter, what would y'all want out of it? What would make you excited to see the notification in your inbox? @emmatyping.dev and I were brainstorming a bit on this the other day, inspired a bit by @thisweekinrust.bsky.social.

Since it's now linked in the What's New for Python 3.15, I decided to migrate doesjitgobrrr.com to proper cloud hosting and out of my closet RPi cluster. The once unofficial JIT benchmarking site is now *official*, has a new look, and hosted on the very best @fastapicloud.com 🖤!

Do you code with Cursor? ↗️ Try the official (and verified ✅) FastAPI Extension from the marketplace ✨ open-vsx.org/extension/Fa...

Are you using Google Antigravity as your editor? ☄️ Now you can install the official FastAPI Extension open-vsx.org/extension/Fa... 🎁

Long-awaited, Server-Sent Events in @fastapi.tiangolo.com ✨

This @fastapi.tiangolo.com feature has been cooking in my mind for 2 years or so. 😅 So happy it's finally out there. And I think the developer experience is just right (minimal and simple). ✨

I've been working on something very cool for the past few months and today, it's finally yours! The *official* @fastapi.tiangolo.com extension for VS Code has launched! 🎉 Install: marketplace.visualstudio.com/items?itemNa... GitHub: github.com/fastapi/fast...

There's a @vscode.dev extension for @fastapi.tiangolo.com now! 🤯 It's so enjoyable to use, try it! @savannah.dev did an amazing job with it. 🙌

Libraries should be able to provide their own official AI Agent Skills, in sync with new versions and features. So I'm starting by shipping this in FastAPI. Next, Typer, SQLModel, etc. 🚀 Now it's time to ask your favorite coding agent to support it. 😎 tiangolo.com/ideas/librar...

FastAPI 0.132.0 adds strict Content-Type checking for JSON requests 🏰 This would solve a CSRF risk in local-network apps (apps intended to run on users' machines, on localhost) 🔒️ If your clients don't send a Content-Type, you can also disable it: fastapi.tiangolo.com/advanced/str...

You get so many features from @fastapi.tiangolo.com when you declare a return type - response model... And now you also get the best performance possible 😎🚀

🐛 Here's FastAPI 0.129.1 with a bug fix in the JSON Schema for binary data and file uploads. 📝 And a new guide to use base64 binary data in JSON payloads: fastapi.tiangolo.com/advanced/jso...

Asyncer 0.0.15 drops support for Python 3.9 🪓 github.com/fastapi/asyn...

SQLModel 0.0.35 drops support for Python 3.9 🪓 github.com/fastapi/sqlm...

Typer 0.24.0 just released, dropping support for Python 3.9 (that reached End of Life some months ago) 🪓 typer.tiangolo.com

I've been dreaming of this day since around one year ago when I started the LLM translations setup. ✨ Actually since the first translations years ago, LLMs made it actually feasible now. I like when technology makes things easier and more accessible to all humans. 🌐

Here's Typer 0.23.1 with a small bug fix 🐛 Thanks Brian Kohan! 🙌 ...and soon, dropping support for Python 3.9 🪓 typer.tiangolo.com

You can't imagine how happy I am to finally be able to use the vertical bar (|) for type unions in the internal code 😁

In Typer 0.23.0 (just released 🍫), when there are errors, by default it no longer shows local variables, but you can opt-in to enable it typer.tiangolo.com/tutorial/exc...

Typer 0.22.0 is out, dropping support for typer-slim, now it's all just typer, with Rich by default 🚀 If you don't know, don't worry, just keep using Typer 😎 If your app depends on typer-slim, change the dependency to typer 🔁 typer.tiangolo.com

We had a great chat at the @talkpython.fm podcast with @mkennedy.codes and some of my teammates: @patrick.wtf, @savannah.dev, @nucleonjohn.bsky.social🎙️ If you're curious about what goes underneath @fastapicloud.com, check it out 🎧️

Here's Typer 0.21.2 🎁 The highlight, @oxykodit.bsky.social added the official reference docs: typer.tiangolo.com/reference/ And updated the guide to build a Typer package to now use uv: typer.tiangolo.com/tutorial/pac...

Here's FastAPI 0.128.7 with a couple of bug fixes and small features 🍰 ...the plan is to release 0.129.0 today, dropping support for Python 3.9 🪓 github.com/fastapi/fast...

Several FastAPI releases during the weekend and today with internal refactors and a bug fix, the latest is 0.128.6 🤓

How much do you like Friday releases? 🍫 FastAPI 0.128.3, compatible with the latest (and future) Starlette 🚀 github.com/fastapi/fast...

Here's FastAPI 0.128.2, with more bug fixes and features 🎁 github.com/fastapi/fast...

Only 1 more day to fill the Typer developer survey! ⌨️ The results will guide future features and (breaking) changes. 🔥 forms.gle/XEH3NL2wqpFP...

FastAPI 0.128.1 comes with with several small bug fixes and features 🍰 fastapi.tiangolo.com

Do you like Typer? ⌨️ Fill the Typer developer survey and help us define its future ✨ forms.gle/uT8SYQRoxuPz...

Here's SQLModel 0.0.32, fix support for Annotated fields with @pydantic.dev 2.12+ 🐛 Thanks @vimota.bsky.social ! 🙌 And thanks @patrick.wtf , @oxykodit.bsky.social , and YuriiMotov for the work and help. 🍰 sqlmodel.tiangolo.com

It feels so good to see 0 issues, 0 PRs ...in one of the big repos! This one recently got 40k GitHub stars 🤩

Deploy to FastAPI Cloud right from CI 🚀

With great LLMs comes great responsibility 😅 Avoid a Human Effort Denial of Service 🤖

LLMs are great at translating, when properly guided ✨ If more native speakers help review, there will be @fastapi.tiangolo.com docs in: French Japanese Traditional Chinese Turkish Simplified Chinese Korean Ukrainian github.com/fastapi/fast...

Now all the @fastapi.tiangolo.com and friends repos are fully managed by uv (as uv projects), because uv is awesome. It can even handle all our quirks. For development, publishing, scripts, CI, etc. Use uv. ✨ Thanks @nucleonjohn.bsky.social for the migration! 🙌

There's now a @fastapicloud.com account here on Bluesky 🤓

Typer 0.21.1 🐛 With a bug fix by @oxykodit.bsky.social 🎉 typer.tiangolo.com

This past year: So many releases of @fastapi.tiangolo.com and friends ✨ Got the best team and first waves of private beta users in FastAPI Cloud 🚀 🐍 I gave keynotes at the Python conferences of: Europe Taiwan Japan Spain Brazil We're building so many cool things! Happy New Year! 🎆

I just migrated the docs for Asyncer from Material for MkDocs to @zensical.org ✨ I was expecting a challenge, I was disappointed, it was too easy. 😂 Install and run, that's it. All the configs unchanged, even the CLI preserves the exact same commands. ☕️ asyncer.tiangolo.com

Here's SQLModel 0.0.31, dropping support for Pydantic v1 ⚰️ Now @pydantic.dev 2.7.0 or above is required ⬆️ sqlmodel.tiangolo.com

I made the first public announcement of @fastapi.tiangolo.com 7 years ago, around these dates 🎂 It was intended as a gift 🎁 Cool stuff coming next year in FastAPI for you. Here's to the next to come! 🥂

Learning from @sethmlarson.dev here sethmlarson.dev/deprecations... Applying it to @fastapi.tiangolo.com 🤓

Here's Asyncer 0.0.12, dropping support for Python 3.9 ⚰️ asyncer.tiangolo.com

Here's SQLModel 0.0.30 🎁 Dropping support for Python 3.8 ⚰️ This included a lot of work from YuriiMotov, upgrading the syntax in the docs examples and their tests 📝 sqlmodel.tiangolo.com