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0 pointsm45t3r6y ago0 comments

Python can easily get a B for large projects if you use something like mypy. However sure, where the language really shines is as a substitute for scripts, so smallish pieces of code.

And environment... It is complicated. It is not that it is that bad, however it sure lacks some polish. The solution is not easy either since even if you solved the problem today (like using poetry), there is still the whole backwards compatibility problem.

There is various hacks to make things easier, however in the end the problem is still more complicated than it should.

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zmmmmm6y ago· 1 in thread

> Python can easily get a B for large projects if you use something like mypy

I'm curious if that's actually true - my actual experience is that it actually suffers horribly in large projects because as the size and complexity goes up it's just harder and harder for its heuristics to not produce false positive typing errors. It worked great on a small library where it could see the whole source and everything was well annotated ... but that's sort of the context where it is least needed in the first place ...

m45t3rOP6y ago

Well, Instagram [1] and Dropbox [2] are probably the biggest Python projects in the whole world, and they both are using mypy and seem to be successful.

And my particular experience with it is very positive, even if my project that is using it is still small (it is getting bigger though, and mypy is really helping me to refactor it when I needed).

Most of the "false positives" that mypy reports to me end up being code that is overly cleverly, and rewriting it to make mypy happy also improves the code quality.

[1]: https://developers.facebook.com/videos/f8-2018/type-checked-...

[2]: https://blogs.dropbox.com/tech/2019/09/our-journey-to-type-c...

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