///

```Python
commons: CommonQueryParams ...
```

////

...doesn't have any special meaning for **FastAPI**. FastAPI won't use it for data conversion, validation, etc. (as it is using the `Depends(CommonQueryParams)` for that).

You could actually write just:

//// tab | Python 3.8+

```Python
commons: Annotated[Any, Depends(CommonQueryParams)]
```

///

### JSON Schema's `examples` field

But then JSON Schema added an <a href="https://json-schema.org/draft/2019-09/json-schema-validation.html#rfc.section.9.5" class="external-link" target="_blank">`examples`</a> field to a new version of the specification.

    // getHostAddress on android sometimes maps the scope id to an invalid interface name; if the
    // mapped interface isn't present, fallback to use the scope id (which has no validation against
    // present interfaces)
    NetworkInterface scopedInterface = ip.getScopedInterface();
    if (scopedInterface != null) {
      return "%" + scopedInterface.getName();
    }

            ],
            "msg": "value is not a valid integer",
            "type": "type_error.integer"
        }
    ]
}

```

被替换为了以下文本格式的错误信息：

```
1 validation error
path -> item_id
  value is not a valid integer (type=type_error.integer)

```

### `RequestValidationError` vs `ValidationError`

/// warning | "警告"

如果您觉得现在还用不到以下技术细节，可以先跳过下面的内容。

<img src="/img/python-types/image06.png">

## Les modèles Pydantic

<a href="https://docs.pydantic.dev/" class="external-link" target="_blank">Pydantic</a> est une bibliothèque Python pour effectuer de la validation de données.

Vous déclarez la forme de la donnée avec des classes et des attributs.

Chaque attribut possède un type.

///

### JSON Schemas Feld `examples`

Aber dann fügte JSON Schema ein <a href="https://json-schema.org/draft/2019-09/json-schema-validation.html#rfc.section.9.5" class="external-link" target="_blank">`examples`</a>-Feld zu einer neuen Version der Spezifikation hinzu.

top-left-radius:0;border-bottom-left-radius:0}.input-group:not(.has-validation)>.custom-file:not(:last-child) .custom-file-label,.input-group:not(.has-validation)>.custom-file:not(:last-child) .custom-file-label::after,.input-group:not(.has-validation)>.custom-select:not(:last-child),.input-group:not(.has-validation)>.form-control:not(:last-child){border-top-right-radius:0;border-bottom-right-radius:0}.input-group.has-validation>.custom-file:nth-last-child(n+3) .custom-file-label,.input-group.ha...

- Dynamic Resource Allocation (DRA): client-side validation of a ResourceHandle would have accepted a missing DriverName, whereas server-side validation then would have raised an error. ([#124075](https://github.com/kubernetes/kubernetes/pull/124075), [@pohly](https://github.com/pohly))

border-bottom-left-radius: 0;\n}\n\n.input-group:not(.has-validation) > .form-control:not(:last-child),\n.input-group:not(.has-validation) > .custom-select:not(:last-child),\n.input-group:not(.has-validation) > .custom-file:not(:last-child) .custom-file-label,\n.input-group:not(.has-validation) > .custom-file:not(:last-child) .custom-file-label::after {\n  border-top-right-radius: 0;\n  border-bottom-right-radius: 0;\n}\n\n.input-group.has-validation > .form-control:nth-last-child(n + 3),\n.input-group.has-validation...

```

그리고 역시나 모든 에디터 도움을 받게 되겠죠.

<img src="/img/python-types/image06.png">

## Pydantic 모델

<a href="https://docs.pydantic.dev/" class="external-link" target="_blank">Pydantic</a>은 데이터 검증(Validation)을 위한 파이썬 라이브러리입니다.

당신은 속성들을 포함한 클래스 형태로 "모양(shape)"을 선언할 수 있습니다.

그리고 각 속성은 타입을 가지고 있습니다.

이 클래스를 활용하여서 값을 가지고 있는 인스턴스를 만들게 되면, 필요한 경우에는 적당한 타입으로 변환까지 시키기도 하여 데이터가 포함된 객체를 반환합니다.