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from typing import List, Optional

from fastapi import FastAPI

from pydantic import BaseModel

app = FastAPI()

class Item(BaseModel):

name: str

description: Optional[str] = None

price: float

tax: float = 10.5

tags: List[str] = []

items = {

"foo": {"name": "Foo", "price": 50.2},

"bar": {"name": "Bar", "description": "The bartenders", "price": 62, "tax": 20.2},

"baz": {"name": "Baz", "description": None, "price": 50.2, "tax": 10.5, "tags": []},

}

@app.get("/items/{item_id}", response_model=Item, response_model_exclude_unset=True)

async def read_item(item_id: str):

return items[item_id]