Например, у вас есть файл `main.py`:

```Python hl_lines="3"
import os

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

/// tip | Совет

Второй аргумент <a href="https://docs.python.org/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> - это возвращаемое по умолчанию значение.

{* ../../docs_src/python_types/tutorial010.py hl[6] *}


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。

Puedes lograr eso usando <a href="https://docs.pydantic.dev/latest/concepts/validators/#field-after-validator" class="external-link" target="_blank">`AfterValidator` de Pydantic</a> dentro de `Annotated`.

/// tip | Consejo

   * quickly, possibly by handing off the provided request body to another thread to perform
   * writing.
   *
   * [grpc]: https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md
   */
  open fun isDuplex(): Boolean = false

  /**
   * Returns true if this body expects at most one call to [writeTo] and can be transmitted

    # - - - - - - - - - -/

    # /- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    # o classAuthor: (NotRequired - Default 'DBFlute(AutoGenerator)')
    #  The value of the author tag in java-doc of generated classes.
    #  All classes are target.
    #
    #; classAuthor = DBFlute(AutoGenerator)
    # - - - - - - - - - -/

    # /- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

   <span style="background-color:#007166"><font color="#D3D7CF"> server </font></span>  Documentation at <font color="#729FCF"><u style="text-decoration-style:solid">http://0.0.0.0:8000/docs</u></font>

             Logs:

Starlette는 <a href="https://www.python-httpx.org\" class="external-link" target="_blank">HTTPX</a>를 기반으로 하며, 이는 Requests를 기반으로 설계되었기 때문에 매우 친숙하고 직관적입니다.

이를 사용하면 FastAPI에서 <a href="https://docs.pytest.org/" class="external-link" target="_blank">pytest</a>를 직접 사용할 수 있습니다.

## `TestClient` 사용하기

/// info | 정보

```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.

```Python hl_lines="3"
import os

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

/// tip | Consejo

El segundo argumento de <a href="https://docs.python.org/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> es el valor por defecto a retornar.

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package gradlebuild.docs;

import com.google.common.io.CharStreams;
import org.gradle.api.GradleException;
import org.gradle.internal.UncheckedException;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;