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Jun 10, 2026 · Fundamentals

Getting Started with Pydantic v2: Models, Fields, and Validators

This tutorial walks through every core feature of Pydantic v2 on Python 3.10+, showing how to define models with BaseModel, constrain fields using Field, reuse constraints via Annotated, switch between lax and strict validation modes, write field and model validators, customize serialization, work with nested and recursive models, and generate JSON schemas, all with runnable code examples.