### Kontextmanager in Abhängigkeiten mit `yield` verwenden { #using-context-managers-in-dependencies-with-yield }

/// warning | Achtung

Dies ist mehr oder weniger eine „fortgeschrittene“ Idee.

Wenn Sie gerade erst mit **FastAPI** beginnen, möchten Sie das vielleicht vorerst überspringen.

///

   * instead. For a default value of {@code null}, use {@link #orNull}.
   *
   * <p>Note about generics: The signature {@code public T or(T defaultValue)} is overly
   * restrictive. However, the ideal signature, {@code public <S super T> S or(S)}, is not legal
   * Java. As a result, some sensible operations involving subtypes are compile errors:
   *
   * {@snippet :

    * Se você conhece os tipos do Python, você sabe como usar o Pydantic.
* Vai bem com o/a seu/sua **<abbr title="Ambiente de Desenvolvimento Integrado, similar a um editor de código">IDE</abbr>/<abbr title="Um programa que confere erros de código">linter</abbr>/cérebro**:

Apenas lembre-se, o ponto mais importante é: tente ser gentil. As pessoas chegam com frustrações e, em muitos casos, não perguntam da melhor forma, mas tente ao máximo ser gentil. 🤗

A ideia é que a comunidade do **FastAPI** seja gentil e acolhedora. Ao mesmo tempo, não aceite bullying ou comportamentos desrespeitosos com outras pessoas. Temos que cuidar uns dos outros.

---

Using these ideas, JWT can be used for way more sophisticated scenarios.

In those cases, several of those entities could have the same ID, let's say `foo` (a user `foo`, a car `foo`, and a blog post `foo`).

* **更簡單**：
    * 不需要學習新的 micro-language 來定義結構。
    * 如果你知道 Python 型別，你就知道如何使用 Pydantic。
* 和你的 **<abbr title="Integrated Development Environment，和程式碼編輯器類似">IDE</abbr>/<abbr title="一個檢查程式碼錯誤的工具">linter</abbr>/brain** 都能好好配合：
    * 因為 Pydantic 的資料結構其實就是你自己定義的類別實例，所以自動補齊、linting、mypy 以及你的直覺都能很好地在經過驗證的資料上發揮作用。
* 驗證**複雜結構**：

    --hash=sha256:fb267ce4b83f9c42560e9ff4d30f60f7ae492eacf9c7ede849edf8c1b860e16b
    # via
    #   -r ci/official/requirements_updater/requirements.in
    #   keras-nightly
idna==3.10 \
    --hash=sha256:12f65c9b470abda6dc35cf8e63cc574b1c52b11df2c86030af0ac09b01b13ea9 \
    --hash=sha256:946d195a0d259cbba61165e88e65941f16e9b36ea6ddb97f00452bae8b1287d3
    # via requests
jax==0.4.7 \

    --hash=sha256:fb267ce4b83f9c42560e9ff4d30f60f7ae492eacf9c7ede849edf8c1b860e16b
    # via
    #   -r ci/official/requirements_updater/requirements.in
    #   keras-nightly
idna==3.10 \
    --hash=sha256:12f65c9b470abda6dc35cf8e63cc574b1c52b11df2c86030af0ac09b01b13ea9 \
    --hash=sha256:946d195a0d259cbba61165e88e65941f16e9b36ea6ddb97f00452bae8b1287d3
    # via requests
jax==0.4.7 \

    --hash=sha256:fb267ce4b83f9c42560e9ff4d30f60f7ae492eacf9c7ede849edf8c1b860e16b
    # via
    #   -r ci/official/requirements_updater/requirements.in
    #   keras-nightly
idna==3.10 \
    --hash=sha256:12f65c9b470abda6dc35cf8e63cc574b1c52b11df2c86030af0ac09b01b13ea9 \
    --hash=sha256:946d195a0d259cbba61165e88e65941f16e9b36ea6ddb97f00452bae8b1287d3
    # via requests
jax==0.4.7 \

    * Si conoces los tipos en Python sabes cómo usar Pydantic.
* Se lleva bien con tu **<abbr title="Integrated Development Environment – Entorno de Desarrollo Integrado: similar a un editor de código">IDE</abbr>/<abbr title="Un programa que verifica errores de código">linter</abbr>/cerebro**: