Das bedeutet, Sie können die neueste Version von Pydantic v2 installieren und die alten Pydantic‑v1‑Komponenten aus diesem Untermodul importieren und verwenden, als hätten Sie das alte Pydantic v1 installiert.

{* ../../docs_src/pydantic_v1_in_v2/tutorial001_an_py310.py hl[1,4] *}

            directly.
            """
        ),
    ] = None,
    *,
    use_cache: Annotated[
        bool,
        Doc(
            """
            By default, after a dependency is called the first time in a request, if
            the dependency is declared again for the rest of the request (for example
            if the dependency is needed by several dependencies), the value will be

{* ../../docs_src/path_operation_advanced_configuration/tutorial007_py39.py hl[24:31] *}

/// tip | Tipp

Hier verwenden wir dasselbe Pydantic-Modell wieder.

Aber genauso hätten wir es auch auf andere Weise validieren können.

Da wir es als **Wert an ein Argument übergeben**, anstatt es in einer **Typannotation** zu verwenden, müssen wir `Union` verwenden, sogar in Python 3.10.

Wäre es eine Typannotation gewesen, hätten wir den vertikalen Strich verwenden können, wie in:

```Python
some_variable: PlaneItem | CarItem
```

        ...as we intended.
        ...this would work:
        ...etc.
        others...
        More to come...
        »»»

    Result (German):

        «««
        ... wie wir es beabsichtigt hatten.
        ... das würde funktionieren:
        ... usw.
        Andere ...
        Später mehr ...
        »»»

2) This does not apply in URLs, code blocks, and code snippets. Do not remove or add spaces there.

        by_alias: bool = True,
        exclude_unset: bool = False,
        exclude_defaults: bool = False,
        exclude_none: bool = False,
    ) -> Any:
        # What calls this code passes a value that already called
        # self._type_adapter.validate_python(value)
        return self._type_adapter.dump_python(
            value,
            mode=mode,
            include=include,
            exclude=exclude,

Jetzt ist es soweit, dies mit FastAPI zu verwenden. 🚀

Wir hatten diese Typannotation:

//// tab | Python 3.10+

```Python
q: str | None = None
```

////

//// tab | Python 3.9+

```Python
q: Union[str, None] = None
```

////

"English single typographic quotes"

    The characters «‘» and «’»
    Unicode U+2018 (LEFT SINGLE QUOTATION MARK) and Unicode U+2019 (RIGHT SINGLE QUOTATION MARK)

"code snippet"

    Also called "inline code". Text in a Markdown document which is surrounded by single backticks. A paragraph in a Markdown document can have a more than one code snippet.

    Example:

        «««
        `i am a code snippet`

    embed_body_fields: bool,
) -> tuple[dict[str, Any], list[dict[str, Any]]]:
    values: dict[str, Any] = {}
    errors: list[dict[str, Any]] = []
    assert body_fields, "request_body_to_args() should be called with fields"
    single_not_embedded_field = len(body_fields) == 1 and not embed_body_fields
    first_field = body_fields[0]
    body_to_process = received_body

    fields_to_extract: list[ModelField] = body_fields

        )

    else:
        return jsonable_encoder(response_content)


async def run_endpoint_function(
    *, dependant: Dependant, values: dict[str, Any], is_coroutine: bool
) -> Any:
    # Only called by get_request_handler. Has been split into its own function to
    # facilitate profiling endpoints, since inner functions are harder to profile.
    assert dependant.call is not None, "dependant.call must be a function"