{* ../../docs_src/dependencies/tutorial011_an_py39.py hl[18] *}

이렇게 하면 `checker.fixed_content` 속성에 `"bar"`라는 값을 담아 의존성을 "매개변수화"할 수 있습니다.

## 인스턴스를 의존성으로 사용하기

그런 다음, `Depends(FixedContentQueryChecker)` 대신 `Depends(checker)`에서 이 `checker` 인스턴스를 사용할 수 있으며,
클래스 자체가 아닌 인스턴스 `checker`가 의존성이 됩니다.

의존성을 해결할 때 **FastAPI**는 이 `checker`를 다음과 같이 호출합니다:

```Python
checker(q="somequery")
```

    }

    @Override
    public @Nullable Object[] toArray() {
      return standardToArray();
    }

    @Override
    @SuppressWarnings("nullness") // bug in our checker's handling of toArray signatures
    public <T extends @Nullable Object> T[] toArray(T[] array) {
      return standardToArray(array);
    }

    @Override
    public String toString() {

        verify(transport).isSigningOptional();
        verify(transport).isSigningEnforced();
    }

    // Error propagation: signing checks may throw SmbException
    @Test
    @DisplayName("signing checks propagate SmbException")
    void signingChecks_throw() throws Exception {
        doThrow(new SmbException("opt error")).when(transport).isSigningOptional();

    @Test
    void testMatchesVersion() {
        MavenPluginJavaPrerequisiteChecker checker = new MavenPluginJavaPrerequisiteChecker(new GenericVersionScheme());
        assertTrue(checker.matchesVersion("1.0", "1.8"));
        assertTrue(checker.matchesVersion("1.8", "9.0.1+11"));
        assertFalse(checker.matchesVersion("[1.0,2],[3,4]", "2.1"));
        assertTrue(checker.matchesVersion("[1.0,2],[3,4]", "3.1"));

        fw.println("#");
        fw.println("# The checker does not handle implicit section names, so they must be explicit and declared as: [[section-name]]");
        fw.println("#");
        fw.println("# The checker also rejects Markdown-style links, such as [text](https://example.com/something) as they do not render properly");

    }

## Используем экземпляр как зависимость { #use-the-instance-as-a-dependency }

Затем мы можем использовать этот `checker` в `Depends(checker)` вместо `Depends(FixedContentQueryChecker)`, потому что зависимостью является экземпляр `checker`, а не сам класс.

И при разрешении зависимости **FastAPI** вызовет `checker` примерно так:

```Python
checker(q="somequery")

    public FactoryMethodReturnValueTester testSerializable() throws Exception {
      for (Invokable<?, ?> factory : getFactoriesToTest()) {
        Object instance = instantiate(factory);
        if (instance != null) {
          try {
            SerializableTester.reserialize(instance);
          } catch (Exception e) { // sneaky checked exception

              public void close() throws IOException {
                super.close();
                counter[0]--;
              }
            };
          }
        };
    byte[] result = ByteSource.concat(checker, checker, checker).read();
    assertThat(result).hasLength(150);
  }

  private void joinHelper(Integer... spans) throws Exception {
    List<ByteSource> sources = new ArrayList<>();
    int start = 0;

    def __call__(self, q: str = ""):
        if q:
            return self.fixed_content in q
        return False


checker = FixedContentQueryChecker("bar")


@app.get("/query-checker/")
async def read_query_check(fixed_content_included: bool = Depends(checker)):

not use beta APIs, unless you [repackage] them. **If your
code is a library, we strongly recommend using the [Guava Beta Checker] to
ensure that you do not use any `@Beta` APIs!**

[Guava Beta Checker]: https://github.com/google/guava-beta-checker

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