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  1. docs/en/docs/tutorial/query-params-str-validations.md

    ```
    
    ////
    
    The query parameter `q` is of type `Union[str, None]` (or `str | None` in Python 3.10), that means that it's of type `str` but could also be `None`, and indeed, the default value is `None`, so FastAPI will know it's not required.
    
    /// note
    
    FastAPI will know that the value of `q` is not required because of the default value `= None`.
    
    The `Union` in `Union[str, None]` will allow your editor to give you better support and detect errors.
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  2. docs/zh/docs/tutorial/query-params-str-validations.md

    ```
    
    由于我们必须用 `Query(default=None)` 替换默认值 `None`,`Query` 的第一个参数同样也是用于定义默认值。
    
    所以:
    
    ```Python
    q: Union[str, None] = Query(default=None)
    ```
    
    ...使得参数可选,等同于:
    
    ```Python
    q: str = None
    ```
    
    但是 `Query` 显式地将其声明为查询参数。
    
    然后,我们可以将更多的参数传递给 `Query`。在本例中,适用于字符串的 `max_length` 参数:
    
    ```Python
    q: Union[str, None] = Query(default=None, max_length=50)
    ```
    
    将会校验数据,在数据无效时展示清晰的错误信息,并在 OpenAPI 模式的*路径操作*中记录该参​​数。
    
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  3. docs/fr/docs/tutorial/query-params-str-validations.md

    Le paramètre de requête `q` a pour type `Union[str, None]` (ou `str | None` en Python 3.10), signifiant qu'il est de type `str` mais pourrait aussi être égal à `None`, et bien sûr, la valeur par défaut est `None`, donc **FastAPI** saura qu'il n'est pas requis.
    
    /// note
    
    **FastAPI** saura que la valeur de `q` n'est pas requise grâce à la valeur par défaut `= None`.
    
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  4. docs/ko/docs/tutorial/query-params-str-validations.md

    ```Python hl_lines="9"
    {!../../docs_src/query_params_str_validations/tutorial001.py!}
    ```
    
    쿼리 매개변수 `q`는 `Optional[str]` 자료형입니다. 즉, `str` 자료형이지만 `None` 역시 될 수 있음을 뜻하고, 실제로 기본값은 `None`이기 때문에 FastAPI는 이 매개변수가 필수가 아니라는 것을 압니다.
    
    /// note | "참고"
    
    FastAPI는 `q`의 기본값이 `= None`이기 때문에 필수가 아님을 압니다.
    
    `Optional[str]`에 있는 `Optional`은 FastAPI가 사용하는게 아니지만, 편집기에게 더 나은 지원과 오류 탐지를 제공하게 해줍니다.
    
    ///
    
    ## 추가 검증
    
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  5. docs/ja/docs/tutorial/query-params-str-validations.md

    以下のアプリケーションを例にしてみましょう:
    
    ```Python hl_lines="9"
    {!../../docs_src/query_params_str_validations/tutorial001.py!}
    ```
    
    クエリパラメータ `q` は `Optional[str]` 型で、`None` を許容する `str` 型を意味しており、デフォルトは `None` です。そのため、FastAPIはそれが必須ではないと理解します。
    
    /// note | "備考"
    
    FastAPIは、 `q` はデフォルト値が `=None` であるため、必須ではないと理解します。
    
    `Optional[str]` における `Optional` はFastAPIには利用されませんが、エディターによるより良いサポートとエラー検出を可能にします。
    
    ///
    
    ## バリデーションの追加
    
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  6. docs/em/docs/tutorial/query-params-str-validations.md

    {!> ../../docs_src/query_params_str_validations/tutorial001_py310.py!}
    ```
    
    ////
    
    🔢 🔢 `q` 🆎 `Union[str, None]` (⚖️ `str | None` 🐍 3️⃣.1️⃣0️⃣), 👈 ⛓ 👈 ⚫️ 🆎 `str` ✋️ 💪 `None`, & 👐, 🔢 💲 `None`, FastAPI 🔜 💭 ⚫️ 🚫 ✔.
    
    /// note
    
    FastAPI 🔜 💭 👈 💲 `q` 🚫 ✔ ↩️ 🔢 💲 `= None`.
    
     `Union` `Union[str, None]` 🔜 ✔ 👆 👨‍🎨 🤝 👆 👍 🐕‍🦺 & 🔍 ❌.
    
    ///
    
    ## 🌖 🔬
    
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  7. docs/ru/docs/tutorial/query-params-str-validations.md

    //// tab | Python 3.10+
    
    ```Python
    q: str | None = None
    ```
    
    ////
    
    //// tab | Python 3.8+
    
    ```Python
    q: Union[str, None] = None
    ```
    
    ////
    
    Вот что мы получим, если обернём это в `Annotated`:
    
    //// tab | Python 3.10+
    
    ```Python
    q: Annotated[str | None] = None
    ```
    
    ////
    
    //// tab | Python 3.8+
    
    ```Python
    q: Annotated[Union[str, None]] = None
    ```
    
    ////
    
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  8. docs/pt/docs/tutorial/query-params-str-validations.md

    ```
    
    O parâmetro de consulta `q` é do tipo `Union[str, None]`, o que significa que é do tipo `str` mas que também pode ser `None`, e de fato, o valor padrão é `None`, então o FastAPI saberá que não é obrigatório.
    
    /// note | "Observação"
    
    O FastAPI saberá que o valor de `q` não é obrigatório por causa do valor padrão `= None`.
    
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  9. docs/de/docs/tutorial/query-params-str-validations.md

    ```
    
    ////
    
    Der Query-Parameter `q` hat den Typ `Union[str, None]` (oder `str | None` in Python 3.10), was bedeutet, er ist entweder ein `str` oder `None`. Der Defaultwert ist `None`, also weiß FastAPI, der Parameter ist nicht erforderlich.
    
    /// note | "Hinweis"
    
    FastAPI weiß nur dank des definierten Defaultwertes `=None`, dass der Wert von `q` nicht erforderlich ist
    
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  10. fastapi/param_functions.py

                """
            ),
        ] = _Unset,
        # TODO: update when deprecating Pydantic v1, import these types
        # validation_alias: str | AliasPath | AliasChoices | None
        validation_alias: Annotated[
            Union[str, None],
            Doc(
                """
                'Whitelist' validation step. The parameter field will be the single one
                allowed by the alias or set of aliases defined.
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