if (value > 0.0) {
      return value;
    } else {
      return Double.MIN_VALUE;
    }
  }

  private static double ensureInUnitRange(double value) {
    return Doubles.constrainToRange(value, -1.0, 1.0);
  }

{* ../../docs_src/response_model/tutorial003_01_py310.py hl[7:10,13:14,18] *}

Con esto, obtenemos soporte de las herramientas, de los editores y mypy ya que este código es correcto en términos de tipos, pero también obtenemos el filtrado de datos de FastAPI.

剩下的部分在 `yield` 之后，会在应用完成后执行。

### 异步上下文管理器 { #async-context-manager }

如你所见，这个函数有一个装饰器 `@asynccontextmanager`。

它将函数转化为所谓的“**异步上下文管理器**”。

{* ../../docs_src/events/tutorial003_py310.py hl[1,13] *}

在 Python 中，**上下文管理器**是一个你可以在 `with` 语句中使用的东西，例如，`open()` 可以作为上下文管理器使用。

```Python
with open("file.txt") as file:
    file.read()
```

Python 的最近几个版本也有了一个**异步上下文管理器**，你可以通过 `async with` 来使用：

{* ../../docs_src/response_model/tutorial003_01_py310.py hl[7:10,13:14,18] *}

Bununla birlikte, code type’lar açısından doğru olduğu için editörler ve mypy araç desteği verir; ayrıca FastAPI’den veri filtrelemeyi de alırız.

Bu nasıl çalışıyor? Bir bakalım. 🤓

    if (-2 <= b && b <= 2) {
      switch ((int) b) {
        case 0:
          return (k == 0) ? 1 : 0;
        case 1:
          return 1;
        case -1:
          return ((k & 1) == 0) ? 1 : -1;
        case 2:
          return (k < Long.SIZE) ? 1L << k : 0;
        case -2:
          if (k < Long.SIZE) {
            return ((k & 1) == 0) ? 1L << k : -(1L << k);
          } else {

    skipHelper(50, 50, new SlowSkipper(new ByteArrayInputStream(bytes), 0));
    skipHelper(100, -1, new ByteArrayInputStream(bytes));
    assertThrows(EOFException.class, () -> skipHelper(101, 0, new ByteArrayInputStream(bytes)));
  }

  private static void skipHelper(long n, int expect, InputStream in) throws IOException {
    ByteStreams.skipFully(in, n);
    assertEquals(expect, in.read());

	// Output: 0 1 2 3
}

func ExampleBuffer_Cap() {
	buf1 := bytes.NewBuffer(make([]byte, 10))
	buf2 := bytes.NewBuffer(make([]byte, 0, 10))
	fmt.Println(buf1.Cap())
	fmt.Println(buf2.Cap())
	// Output:
	// 10
	// 10
}

func ExampleBuffer_Grow() {
	var b bytes.Buffer
	b.Grow(64)
	bb := b.Bytes()
	b.Write([]byte("64 bytes or fewer"))
	fmt.Printf("%q", bb[:b.Len()])
	// Output: "64 bytes or fewer"
}

				7:  {vDelMarker, vObj}, // disk 7
				8:  {vDelMarker, vObj}, // disk 8
				9:  {vDelMarker, vObj}, // disk 9
				10: {vObj},             // disk 10
				11: {vDelMarker, vObj}, // disk 11
				12: {vDelMarker, vObj}, // disk 12
				13: {vDelMarker, vObj}, // disk 13
				14: {vDelMarker, vObj}, // disk 14
				15: {vDelMarker, vObj}, // disk 15
			},
			quorum:      7,
			reqVersions: 0,

     * <li><code>[1.0,2.0]</code> Versions 1.0 to 2.0 (both included)</li>
     * <li><code>[1.5,)</code> Versions 1.5 and higher</li>
     * <li><code>(,1.0],[1.2,)</code> Versions up to 1.0 (included) and 1.2 or higher</li>
     * </ul>
     *
     * @param spec string representation of a version or version range
     * @return a new {@link VersionRange} object that represents the spec

｛ => {
］ => ]
｝ => }
＿ => _
＜ => <
＞ => >

Ⅰ => 1\u0020
Ⅱ => 2\u0020
Ⅲ => 3\u0020
Ⅳ => 4\u0020
Ⅴ => 5\u0020
Ⅵ => 6\u0020
Ⅶ => 7\u0020
Ⅷ => 8\u0020
Ⅸ => 9\u0020
Ⅹ => 10\u0020

ゐ => い
ゑ => え
ヰ => イ
ヱ => エ

ヴァ => バ
ヴィ => ビ
ヴゥ => ブ
ヴェ => ベ
ヴォ => ボ


Ζ => Z

亞 => 亜
惡 => 悪
蘆 => 芦
鰺 => 鯵
壓 => 圧
菴 => 庵
圍 => 囲