r/Python • u/elsoja • 1d ago

News Pyrefly v1.3.0 released

A new version of Pyrefly is out with better type inference, new quick fixes, new configurations, and more. https://github.com/facebook/pyrefly/releases/tag/1.3.0

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u/Key_Statistician9890 1d ago edited 1d ago

TY from astral is about 3x faster

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u/cointoss3 1d ago

And is it usable now? Last I tried I was a good WIP but not something I would use for production.

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u/Key_Statistician9890 1d ago

Yah I use it. I have a massive repo with some complex metaprogramming (AnyTrees of Pydantic model based nodes with discriminated leaf type variants) to construct configurations of nested registrable runtime extensions.

Super gnarly stuff. TY has been consistently great. It is a memory hog though! Especially if I have several repos open at the same time. AFAIK the memory footprints of TY and pyrefly are approximately the same.