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Don't forget Cython [1]! My understanding is that it's quite useable (though it unfortunately uses a different static type system/syntax than mypy).

[1] http://cython.org/

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Didn't forget it, just didn't include it since to me, it's more like a totally different (and not pretty) language that tries to look like python. I should however include Nuitka [1] since it is fairly usable, it's just the generated version isn't much faster than its interpreted python version.

[1] http://nuitka.net/

Why is Cython a totally different language? It's definitely a superset, what with all the custom syntax for type annotations, struct definitions etc. But you can ignore all that, and just stick to the pure Python subset.

Why does the same not apply to Crystal then?

Guess you can say Crystal is a totally different language as well. It's just to me, Crystal still has the same feel as ruby and Cython doesn't. Again, it's just my opinion, I won't argue if you feel otherwise.

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