Pydantic v2 Best Practices

Pydantic is the most widely used data validation library for Python. This skill covers idiomatic patterns, common pitfalls, and performance guidance for Pydantic v2 (the current major version).

Models

Define models by inheriting from BaseModel

from pydantic import BaseModel, ConfigDict

class User(BaseModel):
    model_config = ConfigDict(str_strip_whitespace=True, extra='forbid')

    id: int
    name: str
    email: str | None = None