fastapi

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from typing import Union
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from fastapi import Body, FastAPI, status
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from fastapi.responses import JSONResponse
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from typing_extensions import Annotated
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app = FastAPI()
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items = {"foo": {"name": "Fighters", "size": 6}, "bar": {"name": "Tenders", "size": 3}}
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@app.put("/items/{item_id}")
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async def upsert_item(
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    item_id: str,
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    name: Annotated[Union[str, None], Body()] = None,
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    size: Annotated[Union[int, None], Body()] = None,
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):
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    if item_id in items:
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        item = items[item_id]
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        item["name"] = name
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        item["size"] = size
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        return item
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    else:
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        item = {"name": name, "size": size}
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        items[item_id] = item
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        return JSONResponse(status_code=status.HTTP_201_CREATED, content=item)
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