fastapi

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from typing import 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: Union[float, None] = None
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class User(BaseModel):
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    username: str
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    full_name: Union[str, None] = None
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@app.put("/items/{item_id}")
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async def update_item(item_id: int, item: Item, user: User):
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    results = {"item_id": item_id, "item": item, "user": user}
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    return results
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