使用 **FastAPI**，你可以定义、校验、记录文档并使用任意深度嵌套的模型（归功于Pydantic）。

## List 字段

你可以将一个属性定义为拥有子元素的类型。例如 Python `list`：

//// tab | Python 3.10+

```Python hl_lines="12"
{!> ../../docs_src/body_nested_models/tutorial001_py310.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="14"
{!> ../../docs_src/body_nested_models/tutorial001.py!}
```

////

这将使 `tags` 成为一个由元素组成的列表。不过它没有声明每个元素的类型。

```

////

//// tab | 🐍 3️⃣.9️⃣ & 🔛

```Python hl_lines="30-35"
{!> ../../docs_src/body_updates/tutorial001_py39.py!}
```

////

//// tab | 🐍 3️⃣.1️⃣0️⃣ & 🔛

```Python hl_lines="28-33"
{!> ../../docs_src/body_updates/tutorial001_py310.py!}
```

////

`PUT` ⚙️ 📨 💽 👈 🔜 ❎ ♻ 💽.

### ⚠ 🔃 ❎

👈 ⛓ 👈 🚥 👆 💚 ℹ 🏬 `bar` ⚙️ `PUT` ⏮️ 💪 ⚗:

```Python

//// tab | Python 3.10+

```Python hl_lines="28-33"
{!> ../../docs_src/body_updates/tutorial001_py310.py!}
```

////

//// tab | Python 3.9+

```Python hl_lines="30-35"
{!> ../../docs_src/body_updates/tutorial001_py39.py!}
```

////

//// tab | Python 3.6+

```Python hl_lines="30-35"
{!> ../../docs_src/body_updates/tutorial001.py!}
```

{!> ../../docs_src/extra_models/tutorial001.py!}
```

////

//// tab | 🐍 3️⃣.1️⃣0️⃣ & 🔛

```Python hl_lines="7  9  14  20  22  27-28  31-33  38-39"
{!> ../../docs_src/extra_models/tutorial001_py310.py!}
```

////

### 🔃 `**user_in.dict()`

#### Pydantic `.dict()`

`user_in` Pydantic 🏷 🎓 `UserIn`.

Pydantic 🏷 ✔️ `.dict()` 👩‍🔬 👈 📨 `dict` ⏮️ 🏷 💽.

Let's take this application as example:

//// tab | Python 3.10+

```Python hl_lines="7"
{!> ../../docs_src/query_params_str_validations/tutorial001_py310.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="9"
{!> ../../docs_src/query_params_str_validations/tutorial001.py!}
```

////

import pytest
from dirty_equals import IsDict
from fastapi.testclient import TestClient

from ...utils import needs_py310


@pytest.fixture(name="client")
def get_client():
    from docs_src.body_fields.tutorial001_py310 import app

    client = TestClient(app)
    return client


@needs_py310
def test_items_5(client: TestClient):
    response = client.put("/items/5", json={"item": {"name": "Foo", "price": 3.0}})

from inline_snapshot import snapshot

from tests.utils import needs_py39, needs_py310


@pytest.fixture(
    name="client",
    params=[
        "tutorial001",
        pytest.param("tutorial001_py310", marks=needs_py310),
        "tutorial001_an",
        pytest.param("tutorial001_an_py39", marks=needs_py39),
        pytest.param("tutorial001_an_py310", marks=needs_py310),
    ],
)

////

//// tab | Python 3.10+ nicht annotiert

/// tip | "Tipp"

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

///

```Python hl_lines="24-25  28"
{!> ../../docs_src/dependency_testing/tutorial001_py310.py!}
```

////

//// tab | Python 3.8+ nicht annotiert

/// tip | "Tipp"

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

///

```Python hl_lines="28-29  32"

////

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

/// tip | "Dica"

Prefira utilizar a versão `Annotated` se possível.

///

```Python hl_lines="24-25  28"
{!> ../../docs_src/dependency_testing/tutorial001_py310.py!}
```

////

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

/// tip | "Dica"

Prefira utilizar a versão `Annotated` se possível.

///

```Python hl_lines="28-29  32"

////

//// tab | Python 3.10+ nicht annotiert

/// tip | "Tipp"

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

///

```Python hl_lines="1"
{!> ../../docs_src/path_params_numeric_validations/tutorial001_py310.py!}
```

////

//// tab | Python 3.8+ nicht annotiert

/// tip | "Tipp"

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

///

```Python hl_lines="3"