```

////

//// tab | Python 3.10+ non-Annotated

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="3  10-14"
{!> ../../docs_src/security/tutorial002_py310.py!}
```

////

//// tab | Python 3.8+ non-Annotated

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="5  12-16"

## Return the same input data

Here we are declaring a `UserIn` model, it will contain a plaintext password:

//// tab | Python 3.10+

```Python hl_lines="7  9"
{!> ../../docs_src/response_model/tutorial002_py310.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="9  11"
{!> ../../docs_src/response_model/tutorial002.py!}
```

////

/// info

```Python hl_lines="9-13"
{!> ../../docs_src/dependencies/tutorial002_py310.py!}
```

////

클래스의 인스턴스를 생성하는 데 사용되는 `__init__` 메서드에 주목하기 바랍니다:

//// tab | 파이썬 3.6 이상

```Python hl_lines="12"
{!> ../../docs_src/dependencies/tutorial002.py!}
```

////

//// tab | 파이썬 3.10 이상

```Python hl_lines="10"
{!> ../../docs_src/dependencies/tutorial002_py310.py!}
```

////

//// tab | Python 3.10+ без Annotated

/// tip | "Подсказка"

Предпочтительнее использовать версию с аннотацией, если это возможно.

///

```Python hl_lines="8"
{!> ../../docs_src/header_params/tutorial002_py310.py!}
```

////

//// tab | Python 3.8+ без Annotated

/// tip | "Подсказка"

Предпочтительнее использовать версию с аннотацией, если это возможно.

///

////

//// tab | Python 3.10+ nicht annotiert

/// tip | "Tipp"

Bevorzugen Sie die `Annotated`-Version, falls möglich.

///

```Python hl_lines="8"
{!> ../../docs_src/header_params/tutorial002_py310.py!}
```

////

//// tab | Python 3.8+ nicht annotiert

/// tip | "Tipp"

Bevorzugen Sie die `Annotated`-Version, falls möglich.

///

```Python hl_lines="10"

///

```Python hl_lines="10"
{!> ../../docs_src/query_param_models/tutorial002_py310.py!}
```

////

//// tab | Python 3.9+ non-Annotated

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="9"
{!> ../../docs_src/query_param_models/tutorial002_py39.py!}
```

////

//// tab | Python 3.8+ non-Annotated

/// tip

```

查询参数的值就是：

* `skip=20`：在 URL 中设定的值
* `limit=10`：使用默认值

## 可选参数

同理，把默认值设为 `None` 即可声明**可选的**查询参数：

//// tab | Python 3.10+

```Python hl_lines="7"
{!> ../../docs_src/query_params/tutorial002_py310.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="9"
{!> ../../docs_src/query_params/tutorial002.py!}
```

////

本例中，查询参数 `q` 是可选的，默认值为 `None`。

/// check | "检查"

```Python hl_lines="3"
{!> ../../docs_src/query_params_str_validations/tutorial002.py!}
```

////

//// tab | 🐍 3️⃣.1️⃣0️⃣ & 🔛

```Python hl_lines="1"
{!> ../../docs_src/query_params_str_validations/tutorial002_py310.py!}
```

////

## ⚙️ `Query` 🔢 💲

& 🔜 ⚙️ ⚫️ 🔢 💲 👆 🔢, ⚒ 🔢 `max_length` 5️⃣0️⃣:

//// tab | 🐍 3️⃣.6️⃣ & 🔛

```Python hl_lines="9"

```Python hl_lines="22"
{!> ../../docs_src/body_multiple_params/tutorial002.py!}
```

////

//// tab | 🐍 3️⃣.1️⃣0️⃣ & 🔛

```Python hl_lines="20"
{!> ../../docs_src/body_multiple_params/tutorial002_py310.py!}
```

////

👉 💼, **FastAPI** 🔜 👀 👈 📤 🌅 🌘 1️⃣ 💪 🔢 🔢 (2️⃣ 🔢 👈 Pydantic 🏷).

, ⚫️ 🔜 ⤴️ ⚙️ 🔢 📛 🔑 (🏑 📛) 💪, & ⌛ 💪 💖:

```JSON
{
    "item": {
        "name": "Foo",

```

////

//// tab | Python 3.10+ non-Annotated

/// tip

尽可能选择使用 `Annotated` 的版本。

///

```Python hl_lines="8"
{!> ../../docs_src/header_params/tutorial002_py310.py!}
```

////

//// tab | Python 3.8+ non-Annotated

/// tip

尽可能选择使用 `Annotated` 的版本。

///

```Python hl_lines="10"
{!> ../../docs_src/header_params/tutorial002.py!}