return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">
<summary>Albo użyj <code>async def</code>...</summary>

Jeżeli twój kod korzysta z `async` / `await`, użyj `async def`:

```Python hl_lines="9  14"
from typing import Union

from fastapi import FastAPI

2BBA..2BBC    ; valid                  ;      ; NV8    # 11.0 OVERLAPPING WHITE SQUARES..OVERLAPPING BLACK SQUARES
2BBD..2BC8    ; valid                  ;      ; NV8    # 7.0  BALLOT BOX WITH LIGHT X..BLACK MEDIUM RIGHT-POINTING TRIANGLE CENTRED
2BC9          ; valid                  ;      ; NV8    # 12.0 NEPTUNE FORM TWO