A great feature of pydantic are the validation hooks that let you intercept serialization/deserialization of specific fields and augment behavior. For example

A great feature of pydantic are the validation hooks that let you intercept serialization/deserialization of specific fields and augment behavior. For example if you are querying a DB that returns a column as a JSON string, trivial with Pydantic to json parse the column are part of deser with an annotation. Pydantic is definitely slower and not a 'zero cost abstraction', but you do get a lot for it.