Pydantic

Overview

Pydantic is a data validation library that uses Python type hints. Define a model class, and Pydantic validates inputs, coerces types, and serializes outputs automatically. Used by FastAPI, LangChain, and most modern Python frameworks.

Instructions

Step 1: Basic Models

# schemas.py — Data models with validation
from pydantic import BaseModel, Field, EmailStr, field_validator
from datetime import datetime