* `security_scopes.scopes` wird `[]` (nichts) für die *Pfadoperation* `read_system_status` enthalten, da diese keine `Security` mit `scopes` deklariert hat, und deren Abhängigkeit `get_current_user` ebenfalls keinerlei `scopes` deklariert.

!!! tip "Tipp"

# Classes as Dependencies

Before diving deeper into the **Dependency Injection** system, let's upgrade the previous example.

## A `dict` from the previous example

In the previous example, we were returning a `dict` from our dependency ("dependable"):

=== "Python 3.10+"

    ```Python hl_lines="9"
    {!> ../../../docs_src/dependencies/tutorial001_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="11"

Podcasts:
  English:
  - author: Real Python
    author_link: https://realpython.com/
    link: https://realpython.com/podcasts/rpp/72/
    title: Starting With FastAPI and Examining Python's Import System - Episode 72
  - author: Python Bytes FM
    author_link: https://pythonbytes.fm/
    link: https://www.pythonpodcast.com/fastapi-web-application-framework-episode-259/

    In diesem Fall müssen Sie sich darüber keine Sorgen machen. 🤷

### Beispiele für Strategien für Vorab-Schritte

Es hängt **stark** davon ab, wie Sie **Ihr System bereitstellen**, und hängt wahrscheinlich mit der Art und Weise zusammen, wie Sie Programme starten, Neustarts durchführen, usw.

Hier sind einige mögliche Ideen:

    * All this would also work for deeply nested JSON objects.
* Convert from and to JSON automatically.
* Document everything with OpenAPI, that can be used by:
    * Interactive documentation systems.
    * Automatic client code generation systems, for many languages.
* Provide 2 interactive documentation web interfaces directly.

---

We just scratched the surface, but you already get the idea of how it all works.

    * All this would also work for deeply nested JSON objects.
* Convert from and to JSON automatically.
* Document everything with OpenAPI, that can be used by:
    * Interactive documentation systems.
    * Automatic client code generation systems, for many languages.
* Provide 2 interactive documentation web interfaces directly.

---

We just scratched the surface, but you already get the idea of how it all works.

* Wie man **Validierungseinschränkungen** wie `maximum_length` oder `regex` setzt.
* Ein sehr leistungsfähiges und einfach zu bedienendes System für **<abbr title="Dependency Injection – Einbringen von Abhängigkeiten: Auch bekannt als Komponenten, Ressourcen, Provider, Services, Injectables">Dependency Injection</abbr>**.

* istemci tarafından ağ üzerinden veri göndermek
* ağ üzerinden istemciye gönderilen veriler
* sistem tarafından okunacak ve programınıza verilecek bir dosya içeriği
* programınızın diske yazılmak üzere sisteme verdiği dosya içerikleri
* uzak bir API işlemi
* bir veritabanı bitirme işlemi
* sonuçları döndürmek için bir veritabanı sorgusu
* vb.

that you can more easily get a good answer, or even solve the problem yourself even before asking. And in GitHub I can make sure I always answer everything, even if it takes some time. I can't personally do that with the chat systems. 😅

Conversations in the chat systems are also not as easily searchable as in GitHub, so questions and answers might get lost in the conversation. And only the ones in GitHub count to become a [FastAPI Expert](fastapi-people.md#fastapi-experts){.internal-link...

### 单独的程序

为了实现这一点，您通常会有一个**单独的程序**来确保您的应用程序在启动时运行。 在许多情况下，它还可以确保其他组件或应用程序也运行，例如数据库。

### 启动时运行的示例工具

可以完成这项工作的工具的一些示例是：

* Docker
* Kubernetes
* Docker Compose
* Docker in Swarm Mode
* Systemd
* Supervisor
* 作为其服务的一部分由云提供商内部处理
* 其他的...

我将在接下来的章节中为您提供更具体的示例。


## 重新启动

与确保应用程序在启动时运行类似，您可能还想确保它在挂掉后**重新启动**。

### 我们会犯错误

作为人类，我们总是会犯**错误**。 软件几乎*总是*在不同的地方隐藏着**bug**。 🐛