Overview

This codelab guides Python developers from the basics of Pydantic to practical intermediate patterns. You’ll learn how to define BaseModel schemas, validate and coerce incoming data, handle nested models and collections, and produce clear error messages. The tutorial covers per-field constraints, custom field and model validators, serialization (model_dump/model_dump_json), and configuration best practices including environment-driven settings. Through concise examples and short exercises you’ll build real-world artifacts (e.g., Book/Product models, nested payloads, and configuration classes) and learn how to integrate Pydantic in APIs and applications. By the end, you’ll be able to design safer input handling, reduce runtime bugs, and apply Pydantic patterns confidently in production projects.