this post was submitted on 06 Oct 2025
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Programming
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I generally agree with your statement, just one thing to keep in mind: Mypy sucks for any library larger than a few thousand lines spread over a couple of files, but pyright is developed by M$ and might be part of their usual Embrace, extend, and extinguish strategy. The other two contenders are pytype (google) and pyre (facebook), so it's not like there's a good selection of independent, good and FOSS type checkers out there at the moment.
Astral - the people behind the ruff linter - are currently developing ty, yet another static type checker for python, with a lot of promise, but it's going to be a couple of months, maybe a year before it is in any shape to be used in production code.
Yeah I'm watching Ty. Pytype and Pyre are not serious options. Nobody really uses them, and Pytype is discontinued. Facebook have a new project called Pyrefly that's also worth watching.
But for now, use Pyright. No argument. If you're really worried about Microsoft (and not Facebook or Google for some reason) then use BasedPyright.