```Python hl_lines="3"
import os

name = os.getenv("MY_NAME", "World")
print(f"Hello {name} from Python")
```

/// tip | "Dica"

O segundo argumento para <a href="https://docs.python.org/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> é o valor padrão a ser retornado.

Se não for fornecido, é `None` por padrão, Aqui fornecemos `"World"` como o valor padrão a ser usado.

{!../../docs_src/python_types/tutorial010.py!}
```

そして、再び、すべてのエディタのサポートを得ることができます:

<img src="https://fastapi.tiangolo.com/img/python-types/image06.png">

## Pydanticのモデル

<a href="https://docs.pydantic.dev/" class="external-link" target="_blank">Pydantic</a> はデータ検証を行うためのPythonライブラリです。

データの「形」を属性付きのクラスとして宣言します。

そして、それぞれの属性は型を持ちます。

      openAPIV3Schema:
        properties:
          spec:
            description: 'Extend the functionality provided by the Istio proxy through
              WebAssembly filters. See more details at: https://istio.io/docs/reference/config/proxy_extensions/wasm-plugin.html'
            properties:
              failStrategy:
                description: |-
                  Specifies the failure behavior for the plugin due to fatal errors.

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * An expanded {@code Iterable} API, providing functionality similar to Java 8's powerful <a href=
 * "https://docs.oracle.com/javase/8/docs/api/java/util/stream/package-summary.html#package.description"
 * >streams library</a> in a slightly different way.
 *
 * <p>The following types of methods are provided:
 *
 * <ul>

- k8s.io/kube-openapi: bf4fb3b → 61e04a5

### Removed
- github.com/docker/libnetwork: [c8a5fca](https://github.com/docker/libnetwork/tree/c8a5fca)



# v1.18.2

[Documentation](https://docs.k8s.io)

## Downloads for v1.18.2

filename | sha512 hash
-------- | -----------

 * [Lets Encrypt's ASN.1 and DER][asn1_and_der] guide.
 *
 * [x690]: https://www.itu.int/rec/T-REC-X.690
 * [asn1_and_der]: https://letsencrypt.org/docs/a-warm-welcome-to-asn1-and-der/
 */
internal class DerReader(source: Source) {
  private val countingSource: CountingSource = CountingSource(source)
  private val source: BufferedSource = countingSource.buffer()

 * `CLEARTEXT` is an insecure configuration that is used for `http://` URLs.

These loosely follow the model set in [Google Cloud Policies](https://cloud.google.com/load-balancing/docs/ssl-policies-concepts). We [track changes](../security/tls_configuration_history.md) to this policy.

* 💯 👩‍💻 🏗 🔛 🇸🇲.
* **⚜**, 🗜, 🎻 📁, 🎏 📨.
* **🎉 & 🍪** 🐕‍🦺.
* 1️⃣0️⃣0️⃣ 💯 💯 💰.
* 1️⃣0️⃣0️⃣ 💯 🆎 ✍ ✍.

## Pydantic ⚒

**FastAPI** 🍕 🔗 ⏮️ (&amp; ⚓️ 🔛) <a href="https://docs.pydantic.dev/" class="external-link" target="_blank"><strong>Pydantic</strong></a>. , 🙆 🌖 Pydantic 📟 👆 ✔️, 🔜 👷.

Чтобы увидеть все варианты, которые у вас есть, ознакомьтесь с документацией <a href="https://docs.pydantic.dev/latest/concepts/types/" class="external-link" target="_blank">по необычным типам Pydantic</a>. Вы увидите некоторые примеры в следующей главе.

* Para corrigir um erro de digitação que você encontrou na documentação.
* Para compartilhar um artigo, video, ou podcast criados por você sobre o FastAPI <a href="https://github.com/fastapi/fastapi/edit/master/docs/en/data/external_links.yml" class="external-link" target="_blank">editando este arquivo</a>.
    * Não se esqueça de adicionar o link no começo da seção correspondente.