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by lyu07282
254 days ago
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> but programmers using the language don't necessarily use these terms. this always annoyed me about the python type annotations, you are supposed to already know what contravariant / covariant / invariant means, like: `typing.TypeVar(name, covariant=False, contravariant=False, infer_variance=False)` Its used in documentation and error messages too: > the SendType of Generator behaves contravariantly, not covariantly or invariantly. https://docs.python.org/3/library/typing.html#annotating-gen... |
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