For example, if some code at some point in the middle, in another dependency or in a *path operation*, made a database transaction "rollback" or created any other exception, you would receive the exception in your dependency.

So, you can look for that specific exception inside the dependency with `except SomeException`.

In the same way, you can use `finally` to make sure the exit steps are executed, no matter if there was an exception or not.

pkg strings, func SplitSeq(string, string) iter.Seq[string] #61901
pkg testing, method (*B) Chdir(string) #62516
pkg testing, method (*B) Context() context.Context #36532
pkg testing, method (*B) Loop() bool #61515
pkg testing, method (*F) Chdir(string) #62516
pkg testing, method (*F) Context() context.Context #36532
pkg testing, method (*T) Chdir(string) #62516
pkg testing, method (*T) Context() context.Context #36532

              break;
            } catch (CancellationException e) {
              finalResults.add(CancellationException.class);
              break;
            } catch (TimeoutException e) {
              // loop
            }
          }
          awaitUnchecked(barrier);
        };
    List<Callable<?>> allTasks = new ArrayList<>();
    allTasks.add(completeSuccessfullyRunnable);

   *     use {@code new File(context.getCacheDir(), "directoryname").mkdir()}, or, if you need an
   *     arbitrary number of temporary directories, you might have to generate multiple directory
   *     names in a loop until {@code mkdir()} returns {@code true}.) For JRE users, prefer {@link
   *     java.nio.file.Files#createTempDirectory}, transforming it to a {@link File} using {@link

You would of course use the same ideas you read in [About FastAPI versions](versions.md) to set the ranges of versions.

For example, your `requirements.txt` could look like:

```
fastapi[standard]>=0.113.0,<0.114.0
pydantic>=2.7.0,<3.0.0
```

And you would normally install those package dependencies with `pip`, for example:

<div class="termy">

```console

    /**
     * Returns true if this reference contains an active value, meaning one that is still considered
     * present in the cache. Active values consist of live values, which are returned by cache
     * lookups, and dead values, which have been evicted but awaiting removal. Non-active values
     * consist strictly of loading values, though during refresh a value may be both active and
     * loading.
     */
    boolean isActive();

      annotatedTypeExists()
          ? NullnessAnnotationReader.FROM_DECLARATION_AND_TYPE_USE_ANNOTATIONS
          : NullnessAnnotationReader.FROM_DECLARATION_ANNOTATIONS_ONLY;

  /**
   * Looks for declaration nullness annotations and, if supported, type-use nullness annotations.
   *
   * <p>Under Android VMs, the methods for retrieving type-use annotations don't exist. This means

さらに、フロントエンドが**ユーザー名**と**パスワード**を使って、バックエンドで認証する方法を用意したいです。

**FastAPI**では、これを**OAuth2**を使用して構築できます。

ですが、ちょっとした必要な情報を探すために、長い仕様のすべてを読む必要はありません。

**FastAPI**が提供するツールを使って、セキュリティを制御してみましょう。

## どう見えるか { #how-it-looks }

まずはこのコードを使って、どう動くか観察します。その後で、何が起こっているのか理解しましょう。

## `main.py`を作成 { #create-main-py }

`main.py`に、下記の例をコピーします:

{* ../../docs_src/security/tutorial001_an_py310.py *}

## 実行 { #run-it }

			name:   "list keys as user set policy that allows listing but denies specific keys",
			method: http.MethodGet,
			path:   kmsKeyListPath,
			query:  map[string]string{"pattern": "*"},
			asRoot: false,

			// It looks like this should allow listing any key that isn't "default-test-key", however
			// the policy engine matches all Deny statements first, without regard to Resources (for KMS).

  static final String ERROR_SELF_LOOP = "self-loops are not allowed";
  static final String ERROR_ADDED_SELF_LOOP = "Should not be allowed to add a self-loop edge.";

  /** Creates and returns an instance of the graph to be tested. */
  abstract Graph<Integer> createGraph();

  /**
   * A proxy method that adds the node {@code n} to the graph being tested. In case of Immutable