```Python
commons: Annotated[dict, Depends(common_parameters)]
```

But because we are using `Annotated`, we can store that `Annotated` value in a variable and use it in multiple places:

{* ../../docs_src/dependencies/tutorial001_02_an_py310.py hl[12,16,21] *}

/// tip

This is just standard Python, it's called a "type alias", it's actually not specific to **FastAPI**.

* <a href="https://tartiflette.io/" class="external-link" target="_blank">🍟</a>
    * ⏮️ <a href="https://tartiflette.github.io/tartiflette-asgi/" class="external-link" target="_blank">🍟 🔫</a> 🚚 🔫 🛠️
* <a href="https://graphene-python.org/" class="external-link" target="_blank">⚗</a>
    * ⏮️ <a href="https://github.com/ciscorn/starlette-graphene3" class="external-link" target="_blank">💃-Graphene3️⃣</a>

## 🕹 ⏮️ 🍓

# `APIRouter` class

Here's the reference information for the `APIRouter` class, with all its parameters, attributes and methods.

You can import the `APIRouter` class directly from `fastapi`:

```python
from fastapi import APIRouter
```

::: fastapi.APIRouter
    options:
        members:
            - websocket
            - include_router
            - get
            - put
            - post
            - delete

Por ejemplo, hay una <a href="https://hub.docker.com/_/python" class="external-link" target="_blank">Imagen de Python</a> oficial.

Y hay muchas otras imágenes para diferentes cosas como bases de datos, por ejemplo para:

  """Get the python major version."""
  return run_shell([python_bin_path, '-c', 'import sys; print(sys.version[0])'])


def setup_python(environ_cp):
  """Setup python related env variables."""
  # Get PYTHON_BIN_PATH, default is the current running python.
  default_python_bin_path = sys.executable
  ask_python_bin_path = ('Please specify the location of python. [Default is '

```

</div>

それぞれのオプションの意味を見てみましょう：

* `main:app`： `main`は"`main`"という名前のPythonモジュール、つまりファイル`main.py`を意味します。そして `app` は **FastAPI** アプリケーションの変数名です。
    * main:app`はPythonの`import`文と同じようなものだと想像できます：

        ```Python
        from main import app
        ```

    * つまり、`main:app`のコロンは、`from main import app`のPythonの`import`の部分と同じになります。

* `--workers`： 使用するワーカー・プロセスの数で、それぞれがUvicornのワーカーを実行します。

Read more about it in the [FastAPI docs for Testing](https://fastapi.tiangolo.com/tutorial/testing/).

You can import it directly from `fastapi.testclient`:

```python
from fastapi.testclient import TestClient
```

    * Mit <a href="https://tartiflette.github.io/tartiflette-asgi/" class="external-link" target="_blank">Tartiflette ASGI</a>, für ASGI-Integration
* <a href="https://graphene-python.org/" class="external-link" target="_blank">Graphene</a>
    * Mit <a href="https://github.com/ciscorn/starlette-graphene3" class="external-link" target="_blank">starlette-graphene3</a>

## GraphQL mit Strawberry

Beispielsweise gibt es ein offizielles <a href="https://hub.docker.com/_/python" class="external-link" target="_blank">Python-Image</a>.

Und es gibt viele andere Images für verschiedene Dinge wie Datenbanken, zum Beispiel für:

* <a href="https://hub.docker.com/_/postgres" class="external-link" target="_blank">PostgreSQL</a>

Here we are declaring a `UserIn` model, it will contain a plaintext password:

{* ../../docs_src/response_model/tutorial002_py310.py hl[7,9] *}

/// info

To use `EmailStr`, first install <a href="https://github.com/JoshData/python-email-validator" class="external-link" target="_blank">`email-validator`</a>.

Make sure you create a [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and then install it, for example: