> > As far as I know, both Pydantic and marshmallow start using annotation > for runtime type after PEP 563 is accepted. Am I right?
Not quite, pydantic was released in June 2017 (see HN post: https://news.ycombinator.com/item?id=14477222) and always used annotations, PEP 563 was created in September 2017, a few months later. I can't speak about Marshmallow, back then I don't think it used annotations at all, but maybe it does now. When PEP 563 is accepted, there are some tools using runtime type in > annotation, but they are not adopted widely yet. Yes, that's completely fair. Samuel
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