def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">
<summary>অথবা ব্যবহার করুন <code>async def</code>...</summary>

যদি আপনার কোড `async` / `await`, ব্যবহার করে তাহলে `async def` ব্যবহার করুন:

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

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def read_root():

Es spielt keine Rolle. **FastAPI** weiß, was zu tun ist.

!!! note "Hinweis"
    Wenn Ihnen das nichts sagt, lesen Sie den [Async: *„In Eile?“*](../../async.md#in-eile){.internal-link target=_blank}-Abschnitt über `async` und `await` in der Dokumentation.

## Integriert in OpenAPI

Alle Requestdeklarationen, -validierungen und -anforderungen Ihrer Abhängigkeiten (und Unterabhängigkeiten) werden in dasselbe OpenAPI-Schema integriert.

それは重要ではありません。**FastAPI** は何をすべきかを知っています。

!!! note "備考"
    わからない場合は、ドキュメントの[Async: *"In a hurry?"*](../../async.md){.internal-link target=_blank}の中の`async`と`await`についてのセクションを確認してください。

## OpenAPIとの統合

依存関係（およびサブ依存関係）のすべてのリクエスト宣言、検証、および要件は、同じOpenAPIスキーマに統合されます。

つまり、対話型ドキュメントにはこれらの依存関係から得られる全ての情報も含まれているということです:

### 🔃 `def` 🆚 `async def`

📥 👥 ⚙️ 🇸🇲 📟 🔘 *➡ 🛠️ 🔢* & 🔗, &, 🔄, ⚫️ 🔜 🚶 & 🔗 ⏮️ 🔢 💽.

👈 💪 ⚠ 🚚 "⌛".

✋️ 🇸🇲 🚫 ✔️ 🔗 ⚙️ `await` 🔗, 🔜 ⏮️ 🕳 💖:

```Python
user = await db.query(User).first()
```

...& ↩️ 👥 ⚙️:

```Python
user = db.query(User).first()
```

⤴️ 👥 🔜 📣 *➡ 🛠️ 🔢* & 🔗 🍵 `async def`, ⏮️ 😐 `def`,:

* Fix typos in Async docs. PR [#1423](https://github.com/tiangolo/fastapi/pull/1423).

## 0.54.2

* Add translation to Spanish for [Concurrency and async / await - Concurrencia y async / await](https://fastapi.tiangolo.com/es/async/). PR [#1290](https://github.com/tiangolo/fastapi/pull/1290) by [@alvaropernas](https://github.com/alvaropernas).

    stream = io.BytesIO(b"data")
    file = UploadFile(filename="file", file=stream, size=4)
    assert await file.read() == b"data"
    assert file.size == 4
    await file.write(b" and more data!")
    assert await file.read() == b""
    assert file.size == 19
    await file.seek(0)
    assert await file.read() == b"data and more data!"

# Concurrency ve async / await

*path operasyon fonksiyonu* için `async def `sözdizimi,  asenkron kod, eşzamanlılık ve paralellik hakkında bazı ayrıntılar.

## Aceleniz mi var?

<abbr title="too long; didn't read"><strong>TL;DR:</strong></abbr>

Eğer `await` ile çağrılması gerektiğini belirten üçüncü taraf kütüphaneleri kullanıyorsanız, örneğin:

```Python
results = await some_library()
```

      with:
        token: ${{ secrets.FASTAPI_LABEL_APPROVED }}
        config: >
          {
            "approved-1":
              {
                "number": 1,
                "await_label": "awaiting-review"
              }

        "requestBody": {
            "content": {"application/x-yaml": {"schema": Item.schema()}},
            "required": True,
        },
    },
)
async def create_item(request: Request):
    raw_body = await request.body()
    try:
        data = yaml.safe_load(raw_body)
    except yaml.YAMLError:
        raise HTTPException(status_code=422, detail="Invalid YAML")
    try:
        item = Item.parse_obj(data)

    **FastAPI** provides the same `WebSocket` directly just as a convenience for you, the developer. But it comes directly from Starlette.

## Await for messages and send messages

In your WebSocket route you can `await` for messages and send messages.

```Python hl_lines="48-52"
{!../../../docs_src/websockets/tutorial001.py!}
```

You can receive and send binary, text, and JSON data.