from dataclasses import dataclass, field from fastapi import FastAPI @dataclass class Item: name: str price: float tags: list[str] = field(default_factory=list) description: str | None = None tax: float | None = None app = FastAPI() @app.get("/items/next", response_model=Item) async def read_next_item(): return { "name": "Island In The Moon", "price": 12.99, "description": "A place to be playin' and havin' fun", "tags": ["breater"], }