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We already have TypedPython. It's called Mypy, and any organization doing serious or larger scale Python development should already have this hooked up to their CI.

Together with Pycharm you get almost same level of fearless refactoring only C# or Java can offer.

It's a bit shocking to see people not using it or not even being aware of it's existence, because without it large codebases quickly become a steaming pile of unsafe mess.



Agreed, strict use of mypy with editor support is a game changer (particularly its union types and TypedDict)




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