///

## Use the model

Inside of the function, you can access all the attributes of the model object directly:

//// tab | Python 3.10+

```Python hl_lines="19"
{!> ../../docs_src/body/tutorial002_py310.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="21"
{!> ../../docs_src/body/tutorial002.py!}
```

////

## Request body + path parameters

///

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

////

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

/// tip | Dica

Prefira utilizar a versão `Annotated` se possível.

///

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

////

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

@pytest.fixture(
    name="client",
    params=[
        pytest.param("tutorial002", marks=needs_pydanticv2),
        pytest.param("tutorial002_py39", marks=[needs_py39, needs_pydanticv2]),
        pytest.param("tutorial002_py310", marks=[needs_py310, needs_pydanticv2]),
        pytest.param("tutorial002_an", marks=needs_pydanticv2),
        pytest.param("tutorial002_an_py39", marks=[needs_py39, needs_pydanticv2]),

对具有子类型的模型属性也使用相同的标准语法。

因此，在我们的示例中，我们可以将 `tags` 明确地指定为一个「字符串列表」：

//// tab | Python 3.10+

```Python hl_lines="12"
{!> ../../docs_src/body_nested_models/tutorial002_py310.py!}
```

////

//// tab | Python 3.9+

```Python hl_lines="14"
{!> ../../docs_src/body_nested_models/tutorial002_py39.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="14"
{!> ../../docs_src/body_nested_models/tutorial002.py!}
```

## Optional parameters

The same way, you can declare optional query parameters, by setting their default to `None`:

//// 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!}
```

////

```Python hl_lines="21"
{!> ../../docs_src/body/tutorial002.py!}
```

////

//// tab | 🐍 3️⃣.1️⃣0️⃣ & 🔛

```Python hl_lines="19"
{!> ../../docs_src/body/tutorial002_py310.py!}
```

////

## 📨 💪 ➕ ➡ 🔢

👆 💪 📣 ➡ 🔢 & 📨 💪 🎏 🕰.

**FastAPI** 🔜 🤔 👈 🔢 🔢 👈 🏏 ➡ 🔢 🔜 **✊ ⚪️➡️ ➡**, & 👈 🔢 🔢 👈 📣 Pydantic 🏷 🔜 **✊ ⚪️➡️ 📨 💪**.

Аналогично, вы можете объявлять необязательные query-параметры, установив их значение по умолчанию, равное `None`:

//// 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!}
```

////

from tests.utils import needs_py39, needs_py310, needs_pydanticv1, needs_pydanticv2


@pytest.fixture(
    name="client",
    params=[
        pytest.param("tutorial002", marks=needs_pydanticv2),
        pytest.param("tutorial002_py310", marks=[needs_py310, needs_pydanticv2]),
        pytest.param("tutorial002_an", marks=needs_pydanticv2),
        pytest.param("tutorial002_an_py39", marks=[needs_py39, needs_pydanticv2]),

    "tax": 3.2
}
```

Но вы также можете объявить множество параметров тела запроса, например `item` и `user`:

//// tab | Python 3.10+

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

////

//// tab | Python 3.8+

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

////

from tests.utils import needs_py39, needs_py310, needs_pydanticv1, needs_pydanticv2


@pytest.fixture(
    name="client",
    params=[
        pytest.param("tutorial002", marks=needs_pydanticv2),
        pytest.param("tutorial002_py310", marks=[needs_py310, needs_pydanticv2]),
        pytest.param("tutorial002_an", marks=needs_pydanticv2),
        pytest.param("tutorial002_an_py39", marks=[needs_py39, needs_pydanticv2]),