pydantic-core

pydantic-core is the Rust-powered engine that underpins all validation and serialization in Pydantic V2+. Written in Rust via PyO3, it exposes SchemaValidator, SchemaSerializer, ValidationError, and the core_schema builder API to Python. End-users should interact with it only through the higher-level `pydantic` package; direct use is intended for library authors implementing custom types via __get_pydantic_core_schema__. The library releases in lockstep with pydantic — each pydantic-core version is pinned to exactly one pydantic version and does not follow SemVer independently. Current version is 2.44.0, released frequently (multiple times per month) alongside pydantic.