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  1. docs/fr/docs/tutorial/query-params.md

    ## Paramètres optionnels
    
    De la même façon, vous pouvez définir des paramètres de requête comme optionnels, en leur donnant comme valeur par défaut `None` :
    
    ```Python hl_lines="9"
    {!../../../docs_src/query_params/tutorial002.py!}
    ```
    
    Ici, le paramètre `q` sera optionnel, et aura `None` comme valeur par défaut.
    
    !!! check "Remarque"
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  2. docs/fr/docs/tutorial/query-params-str-validations.md

    Donc :
    
    ```Python
    q: Union[str, None] = Query(default=None)
    ```
    
    ... rend le paramètre optionnel, et est donc équivalent à :
    
    ```Python
    q: Union[str, None] = None
    ```
    
    Mais déclare explicitement `q` comme étant un paramètre de requête.
    
    !!! info
        Gardez à l'esprit que la partie la plus importante pour rendre un paramètre optionnel est :
    
        ```Python
        = None
        ```
    
        ou :
    
        ```Python
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  3. docs/fr/docs/tutorial/body.md

    Par exemple, le modèle ci-dessus déclare un "objet" JSON (ou `dict` Python) tel que :
    
    ```JSON
    {
        "name": "Foo",
        "description": "An optional description",
        "price": 45.2,
        "tax": 3.5
    }
    ```
    
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  4. docs/fr/docs/python-types.md

        * Les valeurs de ce dictionnaire sont de type `float`.
    
    #### `Optional`
    
    Vous pouvez aussi utiliser `Optional` pour déclarer qu'une variable a un type, comme `str` mais qu'il est "optionnel" signifiant qu'il pourrait aussi être `None`.
    
    ```Python hl_lines="1  4"
    {!../../../docs_src/python_types/tutorial009.py!}
    ```
    
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  5. docs/fr/docs/index.md

    * Le _chemin_ `/items/{item_id}` a un  _<abbr title="en anglais : path parameter">paramètre</abbr>_ `item_id` qui doit être un `int`.
    * Le _chemin_ `/items/{item_id}` a un _<abbr title="en anglais : query param">paramètre de requête</abbr>_ optionnel `q` de type `str`.
    
    ### Documentation API interactive
    
    Maintenant, rendez-vous sur <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.
    
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  6. guava/src/com/google/common/base/Optional.java

     */
    @DoNotMock("Use Optional.of(value) or Optional.absent()")
    @GwtCompatible(serializable = true)
    @ElementTypesAreNonnullByDefault
    public abstract class Optional<T> implements Serializable {
      /**
       * Returns an {@code Optional} instance with no contained reference.
       *
       * <p><b>Comparison to {@code java.util.Optional}:</b> this method is equivalent to Java 8's
       * {@code Optional.empty}.
       */
      public static <T> Optional<T> absent() {
    Java
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  7. android/guava/src/com/google/common/base/Optional.java

     */
    @DoNotMock("Use Optional.of(value) or Optional.absent()")
    @GwtCompatible(serializable = true)
    @ElementTypesAreNonnullByDefault
    public abstract class Optional<T> implements Serializable {
      /**
       * Returns an {@code Optional} instance with no contained reference.
       *
       * <p><b>Comparison to {@code java.util.Optional}:</b> this method is equivalent to Java 8's
       * {@code Optional.empty}.
       */
      public static <T> Optional<T> absent() {
    Java
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  8. tests/test_security_http_digest_optional.py

    from typing import Optional
    
    from fastapi import FastAPI, Security
    from fastapi.security import HTTPAuthorizationCredentials, HTTPDigest
    from fastapi.testclient import TestClient
    
    app = FastAPI()
    
    security = HTTPDigest(auto_error=False)
    
    
    @app.get("/users/me")
    def read_current_user(
        credentials: Optional[HTTPAuthorizationCredentials] = Security(security),
    ):
        if credentials is None:
    Python
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  9. tests/test_security_http_bearer_optional.py

    from typing import Optional
    
    from fastapi import FastAPI, Security
    from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
    from fastapi.testclient import TestClient
    
    app = FastAPI()
    
    security = HTTPBearer(auto_error=False)
    
    
    @app.get("/users/me")
    def read_current_user(
        credentials: Optional[HTTPAuthorizationCredentials] = Security(security),
    ):
        if credentials is None:
    Python
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  10. tests/test_security_openid_connect_optional.py

    from typing import Optional
    
    from fastapi import Depends, FastAPI, Security
    from fastapi.security.open_id_connect_url import OpenIdConnect
    from fastapi.testclient import TestClient
    from pydantic import BaseModel
    
    app = FastAPI()
    
    oid = OpenIdConnect(openIdConnectUrl="/openid", auto_error=False)
    
    
    class User(BaseModel):
        username: str
    
    
    def get_current_user(oauth_header: Optional[str] = Security(oid)):
        if oauth_header is None:
    Python
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