icontract and pycontracts (Design-by-Contract programming) have runtime type and constraint checking; data validation. Preconditions, Command, Postconditions (assertions, assertions of invariance after command C_funcname executed) https://github.com/Parquery/icontract

pydantic_schemaorg: https://github.com/lexiq-legal/pydantic_schemaorg

> Pydantic_schemaorg contains all the models defined by schema.org. The pydantic classes are auto-generated from the schema.org model definitions that can be found on https://schema.org/version/latest/schemaorg-current-https.js... [ https://github.com/schemaorg/schemaorg/tree/main/data/releas... ]