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Yeah, been on multiple, and for me it felt like a nightmare (maybe I'm just not smart enough) I'll use python for small tools, depending on the planned deployment. But as a general rule, everything north of 2 months developer time (being it just me, or multiple devs) gets a language with static types, at least for the non-glue main components. Glad that JS got TS types for that. My approach has served me well so far.

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Never tried mypy though, I must say. Maybe that saves the day.

I find mypy to be underwhelming in comparison to Typescript, but maybe it's just the ecosystem. Most JS libraries nowadays are either written in Typescript or have type definitions, but some big Python libraries don't (or the types are not complete).

I recently started using mypy and my experience so far is that it's a bit of a pain to get it to play nicely with numpy.

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