## 선택적 매개변수

같은 방법으로 기본값을 `None`으로 설정하여 선택적 매개변수를 선언할 수 있습니다:

```Python hl_lines="9"
{!../../docs_src/query_params/tutorial002.py!}
```

이 경우 함수 매개변수 `q`는 선택적이며 기본값으로 `None` 값이 됩니다.

/// check | "확인"

**FastAPI**는 `item_id`가 경로 매개변수이고 `q`는 경로 매개변수가 아닌 쿼리 매개변수라는 것을 알 정도로 충분히 똑똑합니다.

///

/// note | "참고"

FastAPI는 `q`가 `= None`이므로 선택적이라는 것을 인지합니다.

		debug.PrintStack()
		return metacache{}
	}

	// Grab a write lock, since we create one if we cannot find one.
	b.mu.Lock()
	defer b.mu.Unlock()

	// Check if exists already.
	if c, ok := b.caches[o.ID]; ok {
		c.lastHandout = time.Now()
		b.caches[o.ID] = c
		b.debugf("returning existing %v", o.ID)
		return c
	}

	if !o.Create {
		return metacache{

   * @return the escaped form of {@code string}
   * @throws NullPointerException if {@code string} is null
   */
  @Override
  public String escape(String string) {
    checkNotNull(string); // GWT specific check (do not optimize)
    // Inlineable fast-path loop which hands off to escapeSlow() only if needed
    int length = string.length();
    for (int index = 0; index < length; index++) {

```Python hl_lines="21"
{!../../docs_src/path_operation_configuration/tutorial005.py!}
```

/// info | "情報"

`respnse_description`は具体的にレスポンスを参照し、`description`は*path operation*全般を参照していることに注意してください。

///

/// check | "確認"

OpenAPIは*path operation*ごとにレスポンスの説明を必要としています。

そのため、それを提供しない場合は、**FastAPI** が自動的に「成功のレスポンス」を生成します。

///

<img src="https://fastapi.tiangolo.com/img/tutorial/path-operation-configuration/image03.png">

                }
                errorsForFile.add(new Error(lineNumber, line, errMsg));
            }
            // TODO: Also parse the HTML in the javadoc file to check if the specific method is present
        }
    }

    private boolean fileContainsText(File referencedFile, String text) {
        try {
            for (String line : Files.readAllLines(referencedFile.toPath())) {

		vc, err = globalBucketVersioningSys.Get(bucket)
		if err != nil {
			return err
		}

		// Check if the current bucket has a configured lifecycle policy
		lc, err = globalLifecycleSys.Get(bucket)
		if err != nil && !errors.Is(err, BucketLifecycleNotFound{Bucket: bucket}) {
			return err
		}

		// Check if bucket is object locked.
		lr, err = globalBucketObjectLockSys.Get(bucket)
		if err != nil {
			return err

    // Check the user response. It has the application's original request.
    cacheMiss.assertCode(200)
      .assertBody("B")
      .assertHeader("Donut", "b")
      .assertRequestUrl(server.url("/"))
      .assertSentRequestAtMillis(request2SentAt, request2ReceivedAt)
      .assertReceivedResponseAtMillis(request2SentAt, request2ReceivedAt)

ore{content:"\f5e7"}.fa-chart-area:before{content:"\f1fe"}.fa-chart-bar:before{content:"\f080"}.fa-chart-line:before{content:"\f201"}.fa-chart-pie:before{content:"\f200"}.fa-check:before{content:"\f00c"}.fa-check-circle:before{content:"\f058"}.fa-check-double:before{content:"\f560"}.fa-check-square:before{content:"\f14a"}.fa-cheese:before{content:"\f7ef"}.fa-chess:before{content:"\f439"}.fa-chess-bishop:before{content:"\f43a"}.fa-chess-board:before{content:"\f43c"}.fa-chess-king:before{content:"...

out=$(diff -qpruN /tmp/sitea_dirs.txt /tmp/siteb_dirs.txt)
ret=$?
if [ $ret -ne 0 ]; then
	echo "BUG: expected no 'diff' after replication: $out"
	exit 1
fi

## check if we don't create delete markers on the directory objects, its always permanent delete.
./mc mb sitea/bucket-version/directory/

sleep 2s

./mc rm -r --force sitea/bucket-version/

sleep 2s

                            .builder()
                            .warning(
                                    "Maven4 SecDispatcher disabled; Maven3 fallback may still work, use `mvnenc diag` to check")
                            .build());
            secDispatcher.writeConfiguration(config);
            return OK;
        }
        config.setDefaultDispatcher(result.get("defaultDispatcher").getResult());