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

    !!! tip
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  2. docs/em/docs/tutorial/query-params-str-validations.md

        ```Python hl_lines="7"
        {!> ../../../docs_src/query_params_str_validations/tutorial006c_py310.py!}
        ```
    
    !!! tip
        Pydantic, ❔ ⚫️❔ 🏋️ 🌐 💽 🔬 &amp; 🛠️ FastAPI, ✔️ 🎁 🎭 🕐❔ 👆 ⚙️ `Optional` ⚖️ `Union[Something, None]` 🍵 🔢 💲, 👆 💪 ✍ 🌅 🔃 ⚫️ Pydantic 🩺 🔃 <a href="https://docs.pydantic.dev/latest/concepts/models/#required-optional-fields" class="external-link" target="_blank">✔ 📦 🏑</a>.
    
    ### ⚙️ Pydantic `Required` ↩️ ❕ (`...`)
    
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  3. docs/zh/docs/tutorial/query-params-str-validations.md

    为此,你可以声明`None`是一个有效的类型,并仍然使用`default=...`:
    
    ```Python hl_lines="9"
    {!../../../docs_src/query_params_str_validations/tutorial006c.py!}
    ```
    
    !!! tip
        Pydantic 是 FastAPI 中所有数据验证和序列化的核心,当你在没有设默认值的情况下使用 `Optional` 或 `Union[Something, None]` 时,它具有特殊行为,你可以在 Pydantic 文档中阅读有关<a href="https://docs.pydantic.dev/latest/concepts/models/#required-optional-fields" class="external-link" target="_blank">必需可选字段</a>的更多信息。
    
    ### 使用Pydantic中的`Required`代替省略号(`...`)
    
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  4. docs/ru/docs/tutorial/query-params-str-validations.md

        ```
    
    !!! tip "Подсказка"
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  5. docs/de/docs/tutorial/query-params-str-validations.md

        ```
    
    !!! tip "Tipp"
        Pydantic, welches die gesamte Datenvalidierung und Serialisierung in FastAPI antreibt, hat ein spezielles Verhalten, wenn Sie `Optional` oder `Union[Something, None]` ohne Defaultwert verwenden, Sie können mehr darüber in der Pydantic-Dokumentation unter <a href="https://docs.pydantic.dev/2.3/usage/models/#required-fields" class="external-link" target="_blank">Required fields</a> erfahren.
    
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