///

Door dat te doen, kan je editor ondersteuning bieden, zelfs tijdens het verwerken van items uit de list:

<img src="/img/python-types/image05.png">

Zonder types is dat bijna onmogelijk om te bereiken.

Merk op dat de variabele `item` een van de elementen is in de lijst `items`.

Toch weet de editor dat het een `str` is, en biedt daar vervolgens ondersteuning voor aan.

```Python hl_lines="1  4"
{!../../docs_src/python_types/tutorial009.py!}
```

`str` yerine `Optional[str]` kullanmak editorün bu değerin her zaman `str` tipinde değil bazen `None` tipinde de olabileceğini belirtir ve hataları tespit etmemizde yardımcı olur.

#### Generic tipler

Köşeli parantez içinde tip parametreleri alan bu türler, örneğin:

Dokümantasyona tekrardan çok nadir olarak geleceksin.

Editörün sana nasıl yardım ettiğine bir bak:

* <a href="https://code.visualstudio.com/" class="external-link" target="_blank">Visual Studio Code</a> ile:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

* <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a> ile:

## Tasarım

Sonrasında, (**FastAPI** kullanan bir geliştirici olarak) sahip olmak istediğim "API"ı tasarlamak için biraz zaman harcadım.

Çeşitli fikirleri en popüler Python editörlerinde test ettim: PyCharm, VS Code, Jedi tabanlı editörler.

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[9] *}

Aber dann haben wir ein `dict` im Parameter `commons` der *Pfadoperation-Funktion*.

Und wir wissen, dass Editoren nicht viel Unterstützung (wie etwa Code-Vervollständigung) für `dict`s bieten können, weil sie ihre Schlüssel- und Werttypen nicht kennen.

Das können wir besser machen ...

## Was macht eine Abhängigkeit aus

Ich habe mehrere Ideen in den beliebtesten Python-Editoren getestet: PyCharm, VS Code, Jedi-basierte Editoren.

Laut der letzten <a href="https://www.jetbrains.com/research/python-developers-survey-2018/#development-tools" class="external-link" target="_blank">Python-Entwickler-Umfrage</a>, deckt das etwa 80 % der Benutzer ab.

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[9] *}

But then we get a `dict` in the parameter `commons` of the *path operation function*.

And we know that editors can't provide a lot of support (like completion) for `dict`s, because they can't know their keys and value types.

We can do better...

## What makes a dependency { #what-makes-a-dependency }

<font color="#4E9A06">INFO</font>:     Application startup complete.
</pre>
```

</div>

Es **ALTAMENTE recomendable** que escribas o copies el código, lo edites y lo ejecutes localmente.

Usarlo en tu editor es lo que realmente te muestra los beneficios de FastAPI, al ver cuán poco código tienes que escribir, todos los chequeos de tipos, autocompletado, etc.

---

## Instalar FastAPI

...van:

```Python
        ... "item_name": item.name ...
```

...naar:

```Python
        ... "item_price": item.price ...
```

...en zie hoe je editor de attributen automatisch invult en hun types herkent:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

# Treat all files in the Go repo as binary, with no git magic updating
# line endings. This produces predictable results in different environments.
#
# Windows users contributing to Go will need to use a modern version
# of git and editors capable of LF line endings.
#
# Windows .bat files are known to have multiple bugs when run with LF
# endings, and so they are checked in with CRLF endings, with a test