- **name**: each item must have a name
    - **description**: a long description
    - **price**: required
    - **tax**: if the item doesn't have tax, you can omit this
    - **tags**: a set of unique tag strings for this item
    """

    - **name**: each item must have a name
    - **description**: a long description
    - **price**: required
    - **tax**: if the item doesn't have tax, you can omit this
    - **tags**: a set of unique tag strings for this item
    """

                            "items": {
                                "anyOf": [{"type": "string"}, {"type": "integer"}]
                            },
                        },
                        "msg": {"title": "Message", "type": "string"},
                        "type": {"title": "Error Type", "type": "string"},
                    },
                },
                "HTTPValidationError": {

                            "items": {
                                "anyOf": [{"type": "string"}, {"type": "integer"}]
                            },
                        },
                        "msg": {"title": "Message", "type": "string"},
                        "type": {"title": "Error Type", "type": "string"},
                    },
                },
                "HTTPValidationError": {

## JavaScript-only settings

Swagger UI also allows other configurations to be **JavaScript-only** objects (for example, JavaScript functions).

FastAPI also includes these JavaScript-only `presets` settings:

```JavaScript
presets: [
    SwaggerUIBundle.presets.apis,
    SwaggerUIBundle.SwaggerUIStandalonePreset
]
```

import inspect

from fastapi.openapi.docs import get_redoc_html, get_swagger_ui_html


def test_strings_in_generated_swagger():
    sig = inspect.signature(get_swagger_ui_html)
    swagger_js_url = sig.parameters.get("swagger_js_url").default  # type: ignore
    swagger_css_url = sig.parameters.get("swagger_css_url").default  # type: ignore
    swagger_favicon_url = sig.parameters.get("swagger_favicon_url").default  # type: ignore

    ...
```

Aber genau in dem Moment, in dem Python das erste `j` in `johndoe` mit dem ersten `s` in `stanleyjobson` vergleicht, gibt es `False` zurück, da es bereits weiß, dass diese beiden Strings nicht identisch sind, und denkt, „Es besteht keine Notwendigkeit, weitere Berechnungen mit dem Vergleich der restlichen Buchstaben zu verschwenden“. Und Ihre Anwendung wird zurückgeben „Incorrect username or password“.

### Install `pydantic-settings`

First, install the `pydantic-settings` package:

<div class="termy">

```console
$ pip install pydantic-settings
---> 100%
```

</div>

```Python hl_lines="36-42"
{!../../../docs_src/nosql_databases/tutorial001.py!}
```

### f-strings

`f"userprofile::{username}"` という記載に馴染みがありませんか？これは Python の"<a href="https://docs.python.org/3/glossary.html#term-f-string" class="external-link" target="_blank">f-string</a>"と呼ばれるものです。

f-stringの`{}`の中に入れられた変数は、文字列の中に展開/注入されます。

### `dict` アンパック

The only difference is that **FastAPI**'s `HTTPException` accepts any JSON-able data for the `detail` field, while Starlette's `HTTPException` only accepts strings for it.

So, you can keep raising **FastAPI**'s `HTTPException` as normally in your code.

But when you register an exception handler, you should register it for Starlette's `HTTPException`.