numpydantic/docs/overview.md

Overview

The Python type annotation system is weird and not like the rest of Python! (at least until PEP 0649 gets mainlined). Similarly, Pydantic 2's core_schema system is wonderful but still relatively poorly documented for custom types! This package does the work of plugging them in together to make some kind of type validation frankenstein.

The first problem is that type annotations are evaluated statically by python, mypy, etc. This means you can't use typical python syntax for declaring types - it has to be present at the time __new__ is called, rather than __init__.

• pydantic schema
• validation
• serialization
• lazy loading
• compression