│   │   └── users.py
│   └── internal
│       ├── __init__.py
│       └── admin.py
```

/// tip | Astuce

Il y a plusieurs fichiers `__init__.py` : un dans chaque répertoire ou sous-répertoire.

C'est cela qui permet d'importer du code d'un fichier dans un autre.

Par exemple, dans `app/main.py` vous pourriez avoir une ligne comme :

```
from app.routers import items
```

///

        .name("a")
        .value("b")
        .domain("example.com")
        .sameSite(sameSite)
        .build()
    assertThat(cookie.sameSite).isEqualTo(sameSite)
  }

  /** Note that we permit building a cookie that doesn’t follow the rules. */
  @Test fun builderSameSiteNoneDoesNotRequireSecure() {
    val cookieBuilder =
      Cookie
        .Builder()
        .name("a")
        .value("b")

   * array with a nullable element type. But probably they usually want an array with a non-nullable
   * type. That said, we could *accept* a `@Nullable T[]` (which, given that we treat arrays as
   * covariant, would still permit a plain `T[]`) and return a plain `T[]`. But of course that would
   * require its own suppression, since it is also unsound. toArray(T[]) is just a mess from a

   * to thread contention. But overestimates and underestimates within an order of magnitude do not
   * usually have much noticeable impact. A value of one permits only one thread to modify the cache
   * at a time, but since read operations and cache loading computations can proceed concurrently,
   * this still yields higher concurrency than full synchronization.
   *

 * } else {
 *   // The resource was not cached.
 * }
 * ```
 *
 * This technique works even better in situations where a stale response is better than no response.
 * To permit stale cached responses, use the `max-stale` directive with the maximum staleness in
 * seconds:
 *
 * ```java
 * Request request = new Request.Builder()
 *     .cacheControl(new CacheControl.Builder()

     */
    String getGuestUsername();

    /**
     * Property {@code jcifs.smb.client.allowGuestFallback}, defaults to false
     *
     * @return whether to permit guest logins when user authentication is requested
     */
    boolean isAllowGuestFallback();

    /**
     * Property {@code jcifs.smb.client.useDurableHandles}, defaults to true
     *

Vous devez avoir **un seul objet `engine`** pour tout votre code afin de se connecter à la même base.

{* ../../docs_src/sql_databases/tutorial001_an_py310.py ln[14:18] hl[14:15,17:18] *}

L'utilisation de `check_same_thread=False` permet à FastAPI d'utiliser la même base SQLite dans différents threads. C'est nécessaire car **une seule requête** peut utiliser **plus d'un thread** (par exemple dans des dépendances).

# Paramètres de requête et validations de chaînes de caractères { #query-parameters-and-string-validations }

**FastAPI** vous permet de déclarer des informations et des validations supplémentaires pour vos paramètres.

Prenons cette application comme exemple :

{* ../../docs_src/query_params_str_validations/tutorial001_py310.py hl[7] *}

   */
  static final LazyLogger log = new LazyLogger(AbstractFuture.class);

  static final boolean GENERATE_CANCELLATION_CAUSES;

  static {
    // System.getProperty may throw if the security policy does not permit access.
    boolean generateCancellationCauses;
    try {
      generateCancellationCauses =
          parseBoolean(System.getProperty("guava.concurrent.generate_cancellation_cause", "false"));

    writer.flush()
  }

  /**
   * Degrades this connection such that new streams can neither be created locally, nor accepted
   * from the remote peer. Existing streams are not impacted. This is intended to permit an endpoint
   * to gracefully stop accepting new requests without harming previously established streams.
   */
  @Throws(IOException::class)
  fun shutdown(statusCode: ErrorCode) {
    writer.withLock {