{!../../docs_src/dependencies/tutorial005.py!}
```

这段代码声明了类型为 `str` 的可选查询参数 `q`，然后返回这个查询参数。

这个函数很简单（不过也没什么用），但却有助于让我们专注于了解子依赖项的工作方式。

### 第二层依赖项

接下来，创建另一个依赖项函数，并同时用该依赖项自身再声明一个依赖项（所以这也是一个「依赖项」）：

```Python hl_lines="13"
{!../../docs_src/dependencies/tutorial005.py!}
```

这里重点说明一下声明的参数：

* 尽管该函数自身是依赖项，但还声明了另一个依赖项（它「依赖」于其他对象）
    * 该函数依赖 `query_extractor`, 并把 `query_extractor` 的返回值赋给参数 `q`

    // 12 elements won't overflow
    assertEquals(
        479001600 /*12!*/,
        Collections2.orderedPermutations(newArrayList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12))
            .size());
    // 13 elements overflow an int
    assertEquals(
        Integer.MAX_VALUE,
        Collections2.orderedPermutations(newArrayList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13))
            .size());

  }

  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
  @CollectionSize.Require(absent = {ZERO, ONE})
  public void testSubList_subListRemoveAffectsOriginalLargeList() {
    List<E> subList = getList().subList(1, 3);
    subList.remove(e2());
    List<E> expected = copyToList(createSamplesArray());
    expected.remove(2);
    expectContents(expected);
  }

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)

  }

  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
  @CollectionSize.Require(absent = {ZERO, ONE})
  public void testSubList_subListRemoveAffectsOriginalLargeList() {
    List<E> subList = getList().subList(1, 3);
    subList.remove(e2());
    List<E> expected = copyToList(createSamplesArray());
    expected.remove(2);
    expectContents(expected);
  }

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)

pkg debug/pe, const IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER = 11
pkg debug/pe, const IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER ideal-int
pkg debug/pe, const IMAGE_SUBSYSTEM_EFI_ROM = 13
pkg debug/pe, const IMAGE_SUBSYSTEM_EFI_ROM ideal-int
pkg debug/pe, const IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER = 12
pkg debug/pe, const IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER ideal-int
pkg debug/pe, const IMAGE_SUBSYSTEM_NATIVE = 1

  }

  @Test
  fun contentLengthHeaderIsForbidden() {
    val multipart = MultipartBody.Builder()
    assertFailsWith<IllegalArgumentException> {
      multipart.addPart(
        headersOf("Content-Length", "13"),
        "Hello, World!".toRequestBody(null),
      )
    }
  }

  @Test
  @Throws(IOException::class)
  fun partAccessors() {
    val body =
      MultipartBody.Builder()

)

rem Strips away the " characters
set JAVA_VERSION=%JAVA_VERSION:"=%

rem TODO Check if there are existing mem settings in JAVA_OPTS/CFG_OPTS and use those instead of the below
for /f "delims=. tokens=1-3" %%v in ("%JAVA_VERSION%") do (
    set MAJOR=%%v
    set MINOR=%%w
    set BUILD=%%x

    set META_SIZE=-XX:MetaspaceSize=64M -XX:MaxMetaspaceSize=256M
    if "!MINOR!" LSS "8" (

                    suggestor.suggest();
                } else {
                    suggestor.selectlist("down");
                }
            } else if(e.keyCode == 13) {
                if(isFocusList) {
                    suggestor.fixList();
                }
            }
        });
        $(this).keyup(  function(e){

  // deprecatedFirstTimestamp is the deprecated field assuring backward compatibility with core.v1 Event type.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time deprecatedFirstTimestamp = 13;

  // deprecatedLastTimestamp is the deprecated field assuring backward compatibility with core.v1 Event type.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time deprecatedLastTimestamp = 14;

   * properties, including:
   *
   * <ul>
   *   <li>{@code java.vendor.version} (added in Java 11, listed as optional as of Java 13)
   *   <li>{@code jdk.module.*} (added in Java 9, optional)
   * </ul>
   */
  @CheckForNull
  public String value() {
    return System.getProperty(key);
  }