fastapi

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from typing import List, Union
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from fastapi import FastAPI
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from pydantic import BaseModel
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app = FastAPI()
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class Item(BaseModel):
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    name: str
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    description: Union[str, None] = None
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    price: float
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    tax: float = 10.5
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    tags: List[str] = []
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items = {
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    "foo": {"name": "Foo", "price": 50.2},
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    "bar": {"name": "Bar", "description": "The bartenders", "price": 62, "tax": 20.2},
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    "baz": {"name": "Baz", "description": None, "price": 50.2, "tax": 10.5, "tags": []},
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}
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@app.get("/items/{item_id}", response_model=Item, response_model_exclude_unset=True)
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async def read_item(item_id: str):
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    return items[item_id]
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