</div>

////

## Pythonで環境変数を読み取る

環境変数をPythonの**外側**、ターミナル（や他の方法）で作成し、**Python内で読み取る**こともできます。

例えば、以下のような`main.py`ファイルを用意します:

```Python hl_lines="3"
import os

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

/// tip

<a href="https://docs.python.org/3.8/library/os.html#os.getenv" class="external-link" target="_blank">`os.getenv()`</a> の第2引数は、デフォルトで返される値を指定します。

          Entry<E> entry = entryIterator.next();
          element = entry.getElement();
          remaining = entry.getCount();
        }
        remaining--;
        /*
         * requireNonNull is safe because `remaining` starts at 0, forcing us to initialize
         * `element` above. After that, we never clear it.
         */
        return requireNonNull(element);
      }
    };
  }

```

### 4.2 Lease Context Structure
```java
package jcifs.internal.smb2.lease;

import jcifs.internal.smb2.create.Smb2CreateContext;

public class Smb2LeaseContext extends Smb2CreateContext {
    // Context name for lease request
    public static final String NAME_REQUEST = "RqLs";
    public static final String NAME_RESPONSE = "RqLs";
    
    private Smb2LeaseKey leaseKey;
    private int leaseState;
    private int leaseFlags;

Потім, використовуючи `random.choice()`, ми можемо отримати випадкове значення зі списку, тобто отримуємо кортеж із `(id, name)`. Це може бути щось на зразок `("imdb-tt0371724", "The Hitchhiker's Guide to the Galaxy")`.

Далі ми **присвоюємо ці два значення** кортежу змінним `id` і `name`.

Тож, якщо користувач не вказав ID елемента, він все одно отримає випадкову рекомендацію.

Ví dụ, bạn có một file `main.py` với:

```Python hl_lines="3"
import os

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

/// tip

  }

  @ListFeature.Require(absent = SUPPORTS_ADD_WITH_INDEX)
  @CollectionSize.Require(absent = ZERO)
  /*
   * absent = ZERO isn't required, since unmodList.add() must
   * throw regardless, but it keeps the method name accurate.
   */
  public void testAddAtIndex_unsupportedPresent() {
    assertThrows(UnsupportedOperationException.class, () -> getList().add(0, e0()));
    expectUnchanged();
  }

/**
 * Represents the FILE_BOTH_DIR_INFORMATION structure used in SMB directory enumeration operations.
 * This structure contains comprehensive file information including timestamps, attributes, sizes,
 * short name (8.3 format), and full filename for directory entries.
 */
public class FileBothDirectoryInfo implements FileEntry, Decodable {

    private int nextEntryOffset;
    private int fileIndex;
    private long creationTime;

 */
@Named
@Singleton
@Deprecated
public class DefaultWagonManager extends org.apache.maven.repository.legacy.DefaultWagonManager
        implements WagonManager {

    // NOTE: This must use a different field name than in the super class or IoC has no chance to inject the loggers
    @Inject
    private Logger log;

    @Inject
    private LegacySupport legacySupport;

    @Inject

     * @throws IOException if the stream cannot be created or opened
     */
    @Nonnull
    InputStream openStream() throws IOException;

    /**
     * Returns a human-readable description of where this source came from,
     * used primarily for error messages and debugging.
     * <p>
     * Examples of locations:
     * <ul>
     *   <li>Absolute file path: {@code /path/to/pom.xml}</li>

<abbr title="specification">사양</abbr>에서는 필드 이름이 `username` 및 `password`로 정확하게 명명되어야 하고, JSON이 아닌 폼 필드로 전송해야 합니다.

`Form`을 사용하면 유효성 검사, 예제, 별칭(예: `username` 대신 `user-name`) 등을 포함하여 `Body`(및 `Query`, `Path`, `Cookie`)와 동일한 구성을 선언할 수 있습니다.

/// info | 정보

`Form`은 `Body`에서 직접 상속되는 클래스입니다.

///

/// tip | 팁