@AlexWaygood

🦀 coder at @openai. Sometimes do freelance journalism: @Guardian, @Telegraph, @openDemocracy. Python core dev in my spare time 🐍. Studied 🎶 a while back.

 Manchester, England
alexwaygood.com/
Joined July 2013
  • Tweets735
  • Following966
  • Followers642
59Media
I'm now on 🦋. alexwaygood [dot] bsky [dot] social.
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Charlie Marsh
@charliermarshOct 8
hyperfine 2.0 is out now! It includes support for alternative performance metrics like peak memory usage, CPU cycles, and more.
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Charlie Marsh
@charliermarshSep 24
This was exceptional work from Alex Waygood on our team. I mean look at the attention to detail here. We even flag if-statements involving Enums whose _values_ are all true.
warning[redundant-condition]: Condition is always truthy --> .talk-demos/inline_12.py:8:8 | 8 | if choice: | ^^^^^^ Inferred type is `Choice` | info: `Choice` instances are always truthy because `Choice` cannot be subclassed and does not define `__bool__` or `__len__` --> .talk-demos/inline_12.py:3:7 | 3 | class Choice(Enum): | ^^^^^^^^^^^^ `Choice` defined here | info: `Choice` cannot be subclassed because it is an `Enum` subclass and defines enum members Found 1 diagnostic

ALT warning[redundant-condition]: Condition is always truthy --> .talk-demos/inline_12.py:8:8 | 8 | if choice: | ^^^^^^ Inferred type is `Choice` | info: `Choice` instances are always truthy because `Choice` cannot be subclassed and does not define `__bool__` or `__len__` --> .talk-demos/inline_12.py:3:7 | 3 | class Choice(Enum): | ^^^^^^^^^^^^ `Choice` defined here | info: `Choice` cannot be subclassed because it is an `Enum` subclass and defines enum members Found 1 diagnostic

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Charlie Marsh
@charliermarshSep 24
ty can now detect conditions that are always-true or always-false. The classic example: forgetting to call a function in an if-statement. These aren't type errors, but they're (very) often mistakes. We found and fixed multiple bugs like this internally!
warning[redundant-condition]: Function `condition` is always truthy --> .talk-demos/inline_6.py:3:4 | 3 | if condition: | ^^^^^^^^^ Did you mean to call this function? 4 | pass 5 | / else: 6 | | print("no dice") | |____________________- This following branch is unreachable | help: Replace with `condition()` Found 1 diagnostic

ALT warning[redundant-condition]: Function `condition` is always truthy --> .talk-demos/inline_6.py:3:4 | 3 | if condition: | ^^^^^^^^^ Did you mean to call this function? 4 | pass 5 | / else: 6 | | print("no dice") | |____________________- This following branch is unreachable | help: Replace with `condition()` Found 1 diagnostic

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Charlie Marsh
@charliermarshJul 15
Andrew (@burntsushi5) is back at work! I'm so excited
Charlie Marsh
@charliermarshJun 3
Widely known that Andrew is an incredible programmer, less widely known that he is such a great person. It takes courage to share so openly about your diagnosis.
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Alex Waygood retweeted
Charlie Marsh
@charliermarshJun 11
ty-pre-commit is out now! Pre-commit hooks for type checkers typically require you to either enumerate your dependencies in the hook config, or install them out-of-band. This one Just Works (TM) by leveraging uv to install any necessary dependencies prior to type-checking.
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Andrew Gallant
@burntsushi5Jun 3
I was recently diagnosed with a rare autoimmune disorder called anti-NMDA receptor encephalitis. It's a "disease of chaos" that completely upturned my life for a couple months. I wrote a blog about it that goes into more detail and discusses prognosis. burntsushi.net/encephalitis/
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Mitchell Hashimoto
@mitchellhApr 28
Ghostty is leaving GitHub. I'm GitHub user 1299, joined Feb 2008. I've visited GitHub almost every single day for over 18 years. It's never been a question for me where I'd put my projects: always GitHub. I'm super sad to say this, but its time to go. mitchellh.com/writing/ghostt…

Ghostty Is Leaving GitHub

mitchellh.com
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Charlie Marsh
@charliermarshMar 19
After the deal closes, OpenAI will continue supporting our open source tools, and we'll keep building in the open -- for the Python ecosystem -- just as we have from the start.
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Charlie Marsh
@charliermarshMar 19
We've entered into an agreement to join OpenAI as part of the Codex team. I'm incredibly proud of the work we've done so far, incredibly grateful to everyone that's supported us, and incredibly excited to keep building tools that make programming feel different.
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ran on all files in my codebase. pyright: 5 seconds ty: instant i'm convinced
Charlie Marsh
@charliermarsh16 Dec 2025
Announcing the Beta release of ty: an extremely fast type checker and language server for Python, written in Rust. We now use ty exclusively in our own projects and are ready to recommend it to motivated users. 10x, 50x, even 100x faster than existing type checkers and LSPs.
Comparing ty to Pyrefly, Pyright, and mypy on home-assistant.

ALT Comparing ty to Pyrefly, Pyright, and mypy on home-assistant.

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Zed
@zeddotdev17 Dec 2025
We are so incredibly excited to see ty in beta! @astral_sh ships quality tools.
Charlie Marsh
@charliermarsh16 Dec 2025
Announcing the Beta release of ty: an extremely fast type checker and language server for Python, written in Rust. We now use ty exclusively in our own projects and are ready to recommend it to motivated users. 10x, 50x, even 100x faster than existing type checkers and LSPs.
Comparing ty to Pyrefly, Pyright, and mypy on home-assistant.

ALT Comparing ty to Pyrefly, Pyright, and mypy on home-assistant.

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I am SO excited about ty 🤩 Can't wait to start playing with it
Charlie Marsh
@charliermarsh16 Dec 2025
Announcing the Beta release of ty: an extremely fast type checker and language server for Python, written in Rust. We now use ty exclusively in our own projects and are ready to recommend it to motivated users. 10x, 50x, even 100x faster than existing type checkers and LSPs.
Comparing ty to Pyrefly, Pyright, and mypy on home-assistant.

ALT Comparing ty to Pyrefly, Pyright, and mypy on home-assistant.

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astral.sh/blog/ty
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ty was our most technically-challenging project yet. There are so many people to thank: our contributors, members of the Python typing community, the Salsa team, the Elixir team (whose work strongly influenced our approach to gradual types and intersections), and more.
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On a longer time horizon, though, ty will power semantic capabilities across the Astral toolchain: dead code elimination, unused dependency detection, SemVer-compatible upgrade enforcement, CVE reachability analysis, type-aware linting, and more.
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We want to make Python the most productive programming ecosystem on Earth. Just as with Ruff and uv, our commitment from here is that ty will get significantly better every week by working closely with our users.
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So, so hyped that this release is finally out! It was a huge amount of effort to get this over the line. There's still so much more to do but we're so excited for more folks to try it out and tell us what you think 😃
Charlie Marsh
@charliermarsh16 Dec 2025
Announcing the Beta release of ty: an extremely fast type checker and language server for Python, written in Rust. We now use ty exclusively in our own projects and are ready to recommend it to motivated users. 10x, 50x, even 100x faster than existing type checkers and LSPs.
Comparing ty to Pyrefly, Pyright, and mypy on home-assistant.

ALT Comparing ty to Pyrefly, Pyright, and mypy on home-assistant.

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And as always, such a privilege to be part of this incredible team xitter.cf/charliermarsh/status/2…
Charlie Marsh
@charliermarsh16 Dec 2025
Replying to @charliermarsh
But above all I want to thank our core team: @AlexWaygood, @sharkdp86, @carljm, @DhruvManilawala, @dcreager, @Gankra_, @burntsushi5, @ibraheemdev, @oconnor663, and Micha Reiser. You created ty from nothing and pushed it to be great from Day 1.
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ty also includes a best-in-class diagnostic system, inspired by the Rust compiler's own world-class error messages. A single ty diagnostic can pull in context from multiple files at once to explain not only what's wrong, but why (and, often, how to fix it).
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Announcing the Beta release of ty: an extremely fast type checker and language server for Python, written in Rust. We now use ty exclusively in our own projects and are ready to recommend it to motivated users. 10x, 50x, even 100x faster than existing type checkers and LSPs.
Comparing ty to Pyrefly, Pyright, and mypy on home-assistant.

ALT Comparing ty to Pyrefly, Pyright, and mypy on home-assistant.

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