annotated-types

annotated-types provides reusable constraint metadata objects—such as Gt, Lt, Len, MultipleOf, Timezone, Predicate, and more—to be used with typing.Annotated (PEP 593). It does not enforce constraints itself; enforcement is left to consuming libraries like Pydantic, Hypothesis, or custom validators. Current version is 0.7.0 (released 2024). The project follows an irregular, feature-driven release cadence and was created at PyCon 2022 by the Pydantic and Hypothesis maintainers.