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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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docs/en/docs/tutorial/query-params-str-validations.md
!!! tip
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docs/em/docs/tutorial/query-params-str-validations.md
``` !!! tip Pydantic, ❔ ⚫️❔ 🏋️ 🌐 💽 🔬 & 🛠️ 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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docs/de/docs/tutorial/query-params-str-validations.md
Sprich: ```Python q: Union[str, None] = Query(default=None) ``` ... macht den Parameter optional, mit dem Defaultwert `None`, genauso wie: ```Python q: Union[str, None] = None ``` Und in Python 3.10 und darüber macht: ```Python q: str | None = Query(default=None) ``` ... den Parameter optional, mit dem Defaultwert `None`, genauso wie: ```Python q: str | None = None ```
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docs/zh/docs/tutorial/query-params-str-validations.md
```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(`...`) 如果你觉得使用 `...` 不舒服,你也可以从 Pydantic 导入并使用 `Required`:
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docs/ru/docs/tutorial/query-params-str-validations.md
!!! tip "Подсказка" Pydantic, мощь которого используется в FastAPI для валидации и сериализации, имеет специальное поведение для `Optional` или `Union[Something, None]` без значения по умолчанию. Вы можете узнать об этом больше в документации Pydantic, раздел <a href="https://docs.pydantic.dev/latest/concepts/models/#required-optional-fields" class="external-link" target="_blank">Обязательные Опциональные поля</a>.
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