fastapi

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from typing import Union
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from fastapi import FastAPI
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from fastapi.encoders import jsonable_encoder
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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: Union[str, None] = None
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    description: Union[str, None] = None
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    price: Union[float, None] = None
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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)
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async def read_item(item_id: str):
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    return items[item_id]
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@app.patch("/items/{item_id}", response_model=Item)
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async def update_item(item_id: str, item: Item):
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    stored_item_data = items[item_id]
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    stored_item_model = Item(**stored_item_data)
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    update_data = item.dict(exclude_unset=True)
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    updated_item = stored_item_model.copy(update=update_data)
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    items[item_id] = jsonable_encoder(updated_item)
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    return updated_item
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