### Wie das Importieren funktioniert { #how-the-importing-works }

Die Sektion:

```Python
from .routers import items, users
```

bedeutet:

* Beginnend im selben Package, in dem sich dieses Modul (die Datei `app/main.py`) befindet (das Verzeichnis `app/`) ...

TensorFlow coding style.

#### General guidelines and philosophy for contribution

*   Include unit tests when you contribute new features, as they help to a)
    prove that your code works correctly, and b) guard against future breaking
    changes to lower the maintenance cost.
*   Bug fixes also generally require unit tests, because the presence of bugs
    usually indicates insufficient test coverage.

### Другие формы асинхронного кода { #other-forms-of-asynchronous-code }

Такой стиль использования `async` и `await` относительно новый в языке.

Но он сильно упрощает работу с асинхронным кодом.

/**
 * @author Kevin Bourrillion
 */
@GwtCompatible
@NullUnmarked
public class ImmutableDoubleArrayTest extends TestCase {
  // Test all creation paths very lazily: by assuming asList() works

  public void testOf0() {
    assertThat(ImmutableDoubleArray.of().asList()).isEmpty();
  }

  public void testOf1() {
    assertThat(ImmutableDoubleArray.of(0).asList()).containsExactly(0.0);
  }

				NewPutObjReader(hr),
				ObjectOptions{
					PreserveETag: part.ETag, // Preserve original ETag to ensure same metadata.
					IndexCB: func() []byte {
						return part.Index // Preserve part Index to ensure decompression works.
					},
					NoAuditLog: true,
				})
			if err != nil {
				return fmt.Errorf("decommissionObject: PutObjectPart() %w", err)
			}
			parts[i] = CompletePart{
				ETag:           pi.ETag,

    if (part.length() < 1 || part.length() > MAX_DOMAIN_PART_LENGTH) {
      return false;
    }

    /*
     * GWT claims to support java.lang.Character's char-classification methods, but it actually only
     * works for ASCII. So for now, assume any non-ASCII characters are valid. The only place this
     * seems to be documented is here:
     * https://groups.google.com/d/topic/google-web-toolkit-contributors/1UEzsryq1XI
     *

{* ../../docs_src/bigger_applications/app_an_py310/main.py hl[4:5] title["app/main.py"] *}

由於 `app/routers/users.py` 與 `app/routers/items.py` 是同一個 Python 套件 `app` 的子模組，我們可以用單一的點號 `.` 來進行「相對匯入」。

### 匯入如何運作 { #how-the-importing-works }

這段：

```Python
from .routers import items, users
```

代表：

* 從此模組（檔案 `app/main.py`）所在的相同套件（目錄 `app/`）開始...
* 尋找子套件 `routers`（目錄 `app/routers/`）...

    * 当数据无效时自动生成清晰的错误信息。
    * 即便是多层嵌套的 JSON 对象也会进行校验。
* <dfn title="也被称为：序列化、解析、编组">转换</dfn>输入数据：从网络读取到 Python 数据和类型。读取来源：
    * JSON。
    * 路径参数。
    * 查询参数。
    * Cookies。
    * Headers。
    * Forms。
    * Files。
* <dfn title="也被称为：序列化、解析、编组">转换</dfn>输出数据：从 Python 数据和类型转换为网络数据（JSON）：
    * 转换 Python 类型（`str`、`int`、`float`、`bool`、`list` 等）。
    * `datetime` 对象。
    * `UUID` 对象。
    * 数据库模型。
    * ……以及更多。

        .isEqualTo(new File("/c:/Documents ~ Settings, or not/11-12 12:05"));
  }

  // https://github.com/google/guava/issues/2152
  @AndroidIncompatible // works in newer Android versions but fails at the version we test with
  public void testToFile_androidIncompatible() throws Exception {
    assertThat(ClassPath.toFile(new URL("file:///c:\\Documents ~ Settings, or not\\11-12 12:05")))

  // description talks about `keys`, `values`, and `entries`; here the `keys` and `values` arrays
  // are replaced by a single `elements` array but everything else works similarly.

  /**
   * The hashtable object. This can be either:
   *
   * <ul>
   *   <li>a byte[], short[], or int[], with size a power of two, created by