再一次，可以把 `dataclasses` 与标准类型注解一起使用；

8. 注意，*路径操作函数*使用的是普通函数，不是异步函数；

    与往常一样，在 FastAPI 中，可以按需组合普通函数与异步函数；

    如果不清楚何时使用异步函数或普通函数，请参阅**急不可待？**一节中对 <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank" class="internal-link">`async` 与 `await`</a> 的说明；

9. *路径操作函数*返回的不是数据类（虽然它可以返回数据类），而是返回内含数据的字典列表；

    FastAPI 使用（包含数据类的） `response_model` 参数转换响应。

把 `dataclasses` 与其它类型注解组合在一起，可以组成不同形式的复杂数据结构。

```Python hl_lines="7"
{!../../../docs_src/first_steps/tutorial003.py!}
```

!!! note
    If you don't know the difference, check the [Async: *"In a hurry?"*](../async.md#in-a-hurry){.internal-link target=_blank}.

### Step 5: return the content

```Python hl_lines="8"
{!../../../docs_src/first_steps/tutorial001.py!}
```

Users can wrap common logic in a convention plugin.
For example, a code coverage plugin used as a convention plugin can survey code coverage for the _entire project_ and _not_ just a specific subproject.

TIP: Gradle highly recommends the use of Convention plugins.

[.text-right]

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

**Przypis**:

Jeżeli nie znasz, sprawdź sekcję _"In a hurry?"_ o <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank">`async` i `await` w dokumentacji</a>.

</details>

### Uruchom

Uruchom serwer używając:

<div class="termy">

```console

	"GTB Standard Time":               {"EET", "EEST"},    // Europe/Bucharest
	"Central Europe Standard Time":    {"CET", "CEST"},    // Europe/Budapest
	"E. Europe Standard Time":         {"EET", "EEST"},    // Europe/Chisinau
	"Turkey Standard Time":            {"+03", "+03"},     // Europe/Istanbul
	"Kaliningrad Standard Time":       {"EET", "EET"},     // Europe/Kaliningrad
	"FLE Standard Time":               {"EET", "EEST"},    // Europe/Kiev

            linkRepository.put(name, new ClassLinkMetaData(metaData))
        }

        // workaround to IBM JDK bug
        def createDslDocModelClosure = this.&createDslDocModel.curry(classDocbookDirectory.get().asFile, mainDocbookTemplate, classRepository)

        def doc = mainDocbookTemplate
        use(BuildableDOMCategory) {

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

**Nota**:

e vuoi approfondire, consulta la sezione  _"In a hurry?"_ su <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank">`async` e `await` nella documentazione</a>.

</details>

### Esegui il server

Puoi far partire il server così:

<div class="termy">

```console

Pacific/Pitcairn Pacific/Pohnpei Pacific/Ponape Pacific/Port_Moresby Pacific/Rarotonga Pacific/Saipan Pacific/Samoa Pacific/Tahiti Pacific/Tarawa Pacific/Tongatapu Pacific/Truk Pacific/Wake Pacific/Wallis Pacific/Yap Poland Portugal ROC ROK Singapore Turkey UCT US/Alaska US/Aleutian US/Arizona US/Central US/East-Indiana US/Eastern US/Hawaii US/Indiana-Starke US/Michigan US/Mountain US/Pacific US/Samoa UTC Universal W-SU WET Zulu...

### 👨‍🎨 🐕‍🦺

🌐 🛠️ 🏗 ⏩ & 🏋️ ⚙️, 🌐 🚫 💯 🔛 💗 👨‍🎨 ⏭ ▶️ 🛠️, 🚚 🏆 🛠️ 💡.

🏁 🐍 👩‍💻 🔬 ⚫️ 🆑 <a href="https://www.jetbrains.com/research/python-developers-survey-2017/#tools-and-features" class="external-link" target="_blank">👈 🌅 ⚙️ ⚒ "✍"</a>.

🎂 **FastAPI** 🛠️ ⚓️ 😌 👈. ✍ 👷 🌐.

👆 🔜 🛎 💪 👟 🔙 🩺.

📥 ❔ 👆 👨‍🎨 💪 ℹ 👆:

    return {"item_id": item_id, "q": q}
```

**Примітка**:

Стикнувшись з проблемами, не зайвим буде ознайомитися з розділом _"In a hurry?"_ про <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank">`async` та `await` у документації</a>.

</details>

### Запустіть

Запустіть server з:

<div class="termy">

```console