Activating a virtual environment also changes a couple of other things, but this is one of the most important things it does.

## Checking a Virtual Environment { #checking-a-virtual-environment }

When you check if a virtual environment is active, for example with:

//// tab | Linux, macOS, Windows Bash

Acabas de ver el lugar principal para declarar anotaciones de tipos. Como parámetros de función.

Este también es el lugar principal donde los utilizarías con **FastAPI**.

### Tipos simples { #simple-types }

Puedes declarar todos los tipos estándar de Python, no solo `str`.

Puedes usar, por ejemplo:

* `int`
* `float`
* `bool`
* `bytes`

```
# X.509 Certificate options
#
# DN options

# The organization of the subject.
organization = "Example Inc."

# The organizational unit of the subject.
#unit = "sleeping dept."

# The state of the certificate owner.
state = "Example"

# The country of the subject. Two letter code.
country = "EX"

# The common name of the certificate owner.
cn = "Sally Certowner"

Como estamos usando uma URL relativa, se sua API estivesse localizada em `https://example.com/`, então se referiria a `https://example.com/token`. Mas se sua API estivesse localizada em `https://example.com/api/v1/`, então se referiria a `https://example.com/api/v1/token`.

### Example Tools to Restart Automatically { #example-tools-to-restart-automatically }

In most cases, the same tool that is used to **run the program on startup** is also used to handle automatic **restarts**.

For example, this could be handled by:

* Docker

    if (roughSizeOfEachBucket == 0) {
        // The elements in the list are so small that they can't even be divided into {expectedBucketNumber}.
        // For example, how do you split [0,0,0,0,0] into 3 buckets?
        // In this case, we simply put the elements into these buckets evenly.
        return list.chunked(list.size / expectedBucketNumber, smallElementAggregateFunction)
    }

* **入力モデル** にはパスワードが必要です。
* **出力モデル**はパスワードをもつべきではありません。
* **データベースモデル**はおそらくハッシュ化されたパスワードが必要になるでしょう。

/// danger | 危険

ユーザーの平文のパスワードは絶対に保存しないでください。常に認証に利用可能な「安全なハッシュ」を保存してください。

知らない方は、[セキュリティの章](security/simple-oauth2.md#password-hashing){.internal-link target=_blank}で「パスワードハッシュ」とは何かを学ぶことができます。

///

## 複数のモデル

ここでは、パスワードフィールドをもつモデルがどのように見えるのか、また、どこで使われるのか、大まかなイメージを紹介します:

The MinIO-KES configuration is always the same - regardless of the underlying KMS implementation. Checkout the MinIO-KES [configuration example](https://github.com/minio/kes/wiki/MinIO-Object-Storage).

### Further references

# Primeros Pasos { #first-steps }

El archivo FastAPI más simple podría verse así:

{* ../../docs_src/first_steps/tutorial001_py39.py *}

Copia eso en un archivo `main.py`.

Ejecuta el servidor en vivo:

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:solid">main.py</u>

        super();
    }

    @Test
    public void testResolveParentThrowsUnresolvableModelExceptionWhenNotFound() throws Exception {
        final Parent parent = new Parent();
        parent.setGroupId("ut.simple");
        parent.setArtifactId("artifact");
        parent.setVersion("0");

        UnresolvableModelException e = assertThrows(
                UnresolvableModelException.class,