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  1. docs_src/query_params_str_validations/tutorial004_py39.py

    from typing import Union
    
    from fastapi import FastAPI, Query
    
    app = FastAPI()
    
    
    @app.get("/items/")
    async def read_items(
        q: Union[str, None] = Query(
            default=None, min_length=3, max_length=50, pattern="^fixedquery$"
        ),
    ):
        results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
        if q:
            results.update({"q": q})
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 367 bytes
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  2. docs_src/security/tutorial003_an_py310.py

        return "fakehashed" + password
    
    
    oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
    
    
    class User(BaseModel):
        username: str
        email: str | None = None
        full_name: str | None = None
        disabled: bool | None = None
    
    
    class UserInDB(User):
        hashed_password: str
    
    
    def get_user(db, username: str):
        if username in db:
            user_dict = db[username]
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Mon Nov 24 19:03:06 GMT 2025
    - 2.5K bytes
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  3. docs_src/path_params_numeric_validations/tutorial001_py310.py

    from fastapi import FastAPI, Path, Query
    
    app = FastAPI()
    
    
    @app.get("/items/{item_id}")
    async def read_items(
        item_id: int = Path(title="The ID of the item to get"),
        q: str | None = Query(default=None, alias="item-query"),
    ):
        results = {"item_id": item_id}
        if q:
            results.update({"q": q})
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Fri May 13 23:38:22 GMT 2022
    - 332 bytes
    - Click Count (0)
  4. docs/de/docs/tutorial/body.md

    FastAPI weiß, dass der Wert von `q` nicht erforderlich ist, aufgrund des definierten Defaultwertes `= None`.
    
    Das `str | None` (Python 3.10+) oder `Union` in `Union[str, None]` (Python 3.9+) wird von FastAPI nicht verwendet, um zu bestimmen, dass der Wert nicht erforderlich ist. FastAPI weiß, dass er nicht erforderlich ist, weil er einen Defaultwert von `= None` hat.
    
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 24 10:28:19 GMT 2025
    - 7.9K bytes
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  5. docs/pt/docs/python-types.md

    ```
    
    ////
    
    Em ambos os casos, isso significa que `item` poderia ser um `int` ou um `str`.
    
    #### Possivelmente `None` { #possibly-none }
    
    Você pode declarar que um valor pode ter um tipo, como `str`, mas que ele também pode ser `None`.
    
    No Python 3.6 e superior (incluindo o Python 3.10) você pode declará-lo importando e utilizando `Optional` do módulo `typing`.
    
    ```Python hl_lines="1  4"
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 16.7K bytes
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  6. docs/es/docs/python-types.md

    ```
    
    ////
    
    En ambos casos, esto significa que `item` podría ser un `int` o un `str`.
    
    #### Posiblemente `None` { #possibly-none }
    
    Puedes declarar que un valor podría tener un tipo, como `str`, pero que también podría ser `None`.
    
    En Python 3.6 y posteriores (incluyendo Python 3.10) puedes declararlo importando y usando `Optional` del módulo `typing`.
    
    ```Python hl_lines="1  4"
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 16.4K bytes
    - Click Count (1)
  7. docs_src/query_params/tutorial004_py39.py

    from typing import Union
    
    from fastapi import FastAPI
    
    app = FastAPI()
    
    
    @app.get("/users/{user_id}/items/{item_id}")
    async def read_user_item(
        user_id: int, item_id: str, q: Union[str, None] = None, short: bool = False
    ):
        item = {"item_id": item_id, "owner_id": user_id}
        if q:
            item.update({"q": q})
        if not short:
            item.update(
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 468 bytes
    - Click Count (0)
  8. docs_src/query_params_str_validations/tutorial010_py310.py

    from fastapi import FastAPI, Query
    
    app = FastAPI()
    
    
    @app.get("/items/")
    async def read_items(
        q: str | None = Query(
            default=None,
            alias="item-query",
            title="Query string",
            description="Query string for the items to search in the database that have a good match",
            min_length=3,
            max_length=50,
            pattern="^fixedquery$",
            deprecated=True,
        ),
    ):
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Tue Oct 24 20:26:06 GMT 2023
    - 542 bytes
    - Click Count (0)
  9. docs/en/docs/tutorial/body.md

    /// note
    
    FastAPI will know that the value of `q` is not required because of the default value `= None`.
    
    The `str | None` (Python 3.10+) or `Union` in `Union[str, None]` (Python 3.9+) is not used by FastAPI to determine that the value is not required, it will know it's not required because it has a default value of `= None`.
    
    But adding the type annotations will allow your editor to give you better support and detect errors.
    
    ///
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Dec 20 15:55:38 GMT 2025
    - 6.8K bytes
    - Click Count (0)
  10. docs_src/extra_data_types/tutorial001_py39.py

    @app.put("/items/{item_id}")
    async def read_items(
        item_id: UUID,
        start_datetime: datetime = Body(),
        end_datetime: datetime = Body(),
        process_after: timedelta = Body(),
        repeat_at: Union[time, None] = Body(default=None),
    ):
        start_process = start_datetime + process_after
        duration = end_datetime - start_process
        return {
            "item_id": item_id,
            "start_datetime": start_datetime,
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 755 bytes
    - Click Count (0)
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