```console
$ source .venv/Scripts/activate
```

</div>

////

/// tip | 팁

가상 환경에 새로운 패키지를 설치할 때마다, 해당 환경을 다시 활성화하세요.

이렇게 하면 해당 패키지로 설치된 **터미널(<abbr title="command line interface">CLI</abbr>) 프로그램**을 사용할 때, 전역에 설치된 다른 버전이 아니라, 가상 환경 안에 설치된 정확한 버전을 사용합니다.

///

## 가상 환경이 활성화 여부 확인

가상 환경이 활성화되었는지 확인합니다. (이전 명령어가 제대로 작동했는지 확인합니다).

/// tip | 팁

      String keyToRemove = map.keySet().iterator().next();
      if (supportsRemove) {
        int initialSize = map.size();
        // var oldValue = map.get(keyToRemove);
        map.remove(keyToRemove);
        // This line doesn't hold - see the Javadoc comments above.
        // assertEquals(expectedValue, oldValue);
        assertFalse(map.containsKey(keyToRemove));
        assertEquals(initialSize - 1, map.size());
      } else {

En la versión 1 de Pydantic la configuración se hacía en una clase interna `Config`, en la versión 2 de Pydantic se hace en un atributo `model_config`. Este atributo toma un `dict`, y para obtener autocompletado y errores en línea, puedes importar y usar `SettingsConfigDict` para definir ese `dict`.

///

<a href="https://typer.tiangolo.com" target="_blank"><img src="https://typer.tiangolo.com/img/logo-margin/logo-margin-vector.svg" style="width: 20%;"></a>

If you are building a <abbr title="Command Line Interface">CLI</abbr> app to be used in the terminal instead of a web API, check out <a href="https://typer.tiangolo.com/" class="external-link" target="_blank">**Typer**</a>.

  public void testPuttingTheSameKeyTwiceThrowsOnBuild() {
    Builder<String, Integer> builder =
        new Builder<String, Integer>()
            .put("one", 1)
            .put("one", 1); // throwing on this line would be even better

    IllegalArgumentException expected =
        assertThrows(IllegalArgumentException.class, () -> builder.build());
    assertThat(expected).hasMessageThat().contains("one");
  }

 *             return createExpensiveGraph(key);
 *           }
 *         });
 * }
 *
 * <p>Or equivalently,
 *
 * {@snippet :
 * // In real life this would come from a command-line flag or config file
 * String spec = "maximumSize=10000,expireAfterWrite=10m";
 *
 * LoadingCache<Key, Graph> graphs = CacheBuilder.from(spec)
 *     .removalListener(MY_LISTENER)
 *     .build(

```

/// tip

There are several `__init__.py` files: one in each directory or subdirectory.

This is what allows importing code from one file into another.

For example, in `app/main.py` you could have a line like:

```
from app.routers import items
```

///

* The `app` directory contains everything. And it has an empty file `app/__init__.py`, so it is a "Python package" (a collection of "Python modules"): `app`.

<div class="termy">

```console
$ cd ~/code/prisoner-of-azkaban

$ python main.py

// Error importing sirius, it's not installed 😱
Traceback (most recent call last):
    File "main.py", line 1, in <module>
        import sirius
```

</div>

		}
		if h := disk.Healing(); h != nil && !h.Finished {
			disksToHeal = append(disksToHeal, disk.Endpoint())
		}
	}
	if len(disksToHeal) == globalEndpoints.NEndpoints() {
		// When all disks == all command line endpoints
		// this is a fresh setup, no need to trigger healing.
		return Endpoints{}
	}
	return disksToHeal
}

var newDiskHealingTimeout = newDynamicTimeout(30*time.Second, 10*time.Second)

また、**特定のプログラムの呼び出し**のための環境変数を、そのプログラムのみ、その実行中に限定して利用できるよう作成できます。

そのためには、プログラム起動コマンドと同じコマンドライン上の、起動コマンド直前で環境変数を作成してください。

<div class="termy">

```console
// Create an env var MY_NAME in line for this program call
$ MY_NAME="Wade Wilson" python main.py

// Now it can read the environment variable

Hello Wade Wilson from Python

// The env var no longer exists afterwards
$ python main.py