Pydantic Skill

Think of Pydantic models as PHP type-hinted DTOs, Java POJOs with validation, or Rails Strong Parameters + serializers — but with automatic type coercion and validation built in.

Core Concepts

• BaseModel is the foundation — define fields as class attributes with type hints.
• Pydantic validates and coerces data at instantiation time; invalid data raises ValidationError.
• v2 is the current standard — avoid v1 patterns (validator, orm_mode) in new code.

Defining Models

from pydantic import BaseModel, Field
from datetime import datetime