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  1. 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
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  2. 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
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  3. docs_src/sql_databases/tutorial001_an_py39.py

    from sqlmodel import Field, Session, SQLModel, create_engine, select
    
    
    class Hero(SQLModel, table=True):
        id: Union[int, None] = Field(default=None, primary_key=True)
        name: str = Field(index=True)
        age: Union[int, None] = Field(default=None, index=True)
        secret_name: str
    
    
    sqlite_file_name = "database.db"
    sqlite_url = f"sqlite:///{sqlite_file_name}"
    
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Oct 09 19:44:42 GMT 2024
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  4. docs_src/header_params/tutorial003_py39.py

    from typing import Union
    
    from fastapi import FastAPI, Header
    
    app = FastAPI()
    
    
    @app.get("/items/")
    async def read_items(x_token: Union[list[str], None] = Header(default=None)):
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat May 14 11:59:59 GMT 2022
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  5. docs_src/query_params_str_validations/tutorial011_an_py39.py

    from typing import Annotated, Union
    
    from fastapi import FastAPI, Query
    
    app = FastAPI()
    
    
    @app.get("/items/")
    async def read_items(q: Annotated[Union[list[str], None], Query()] = None):
        query_items = {"q": q}
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Mar 18 12:29:59 GMT 2023
    - 237 bytes
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  6. docs/zh/docs/index.md

    app = FastAPI()
    
    
    class Item(BaseModel):
        name: str
        price: float
        is_offer: Union[bool, None] = None
    
    
    @app.get("/")
    def read_root():
        return {"Hello": "World"}
    
    
    @app.get("/items/{item_id}")
    def read_item(item_id: int, q: Union[str, None] = None):
        return {"item_id": item_id, "q": q}
    
    
    @app.put("/items/{item_id}")
    def update_item(item_id: int, item: Item):
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Oct 11 17:48:49 GMT 2025
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  7. docs_src/query_params/tutorial006_py310.py

    from fastapi import FastAPI
    
    app = FastAPI()
    
    
    @app.get("/items/{item_id}")
    async def read_user_item(
        item_id: str, needy: str, skip: int = 0, limit: int | None = None
    ):
        item = {"item_id": item_id, "needy": needy, "skip": skip, "limit": limit}
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Fri Jan 07 14:11:31 GMT 2022
    - 269 bytes
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  8. docs_src/pydantic_v1_in_v2/tutorial002_an_py310.py

    from fastapi import FastAPI
    from pydantic.v1 import BaseModel
    
    
    class Item(BaseModel):
        name: str
        description: str | None = None
        size: float
    
    
    app = FastAPI()
    
    
    @app.post("/items/")
    async def create_item(item: Item) -> Item:
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Oct 11 16:45:54 GMT 2025
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  9. docs/zh/docs/tutorial/query-params.md

    查询参数的值就是:
    
    * `skip=20`:在 URL 中设定的值
    * `limit=10`:使用默认值
    
    ## 可选参数
    
    同理,把默认值设为 `None` 即可声明**可选的**查询参数:
    
    {* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}
    
    本例中,查询参数 `q` 是可选的,默认值为 `None`。
    
    /// check | 检查
    
    注意,**FastAPI** 可以识别出 `item_id` 是路径参数,`q` 不是路径参数,而是查询参数。
    
    ///
    
    /// note | 笔记
    
    因为默认值为 `= None`,FastAPI 把 `q` 识别为可选参数。
    
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Mon Nov 18 02:25:44 GMT 2024
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  10. tests/test_request_params/test_file/test_required.py

        assert response.json() == {
            "detail": [
                {
                    "type": "missing",
                    "loc": ["body", "p"],
                    "msg": "Field required",
                    "input": None,
                }
            ]
        }
    
    
    @pytest.mark.parametrize(
        "path",
        [
            "/required-bytes",
            "/required-uploadfile",
        ],
    )
    def test_required(path: str):
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Dec 27 18:19:10 GMT 2025
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