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  1. docs_src/schema_extra_example/tutorial004_py39.py

    from typing import Union
    
    from fastapi import Body, FastAPI
    from pydantic import BaseModel
    
    app = FastAPI()
    
    
    class Item(BaseModel):
        name: str
        description: Union[str, None] = None
        price: float
        tax: Union[float, None] = None
    
    
    @app.put("/items/{item_id}")
    async def update_item(
        *,
        item_id: int,
        item: Item = Body(
            examples=[
                {
                    "name": "Foo",
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 824 bytes
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  2. docs_src/body_fields/tutorial001_py39.py

    app = FastAPI()
    
    
    class Item(BaseModel):
        name: str
        description: Union[str, None] = Field(
            default=None, title="The description of the item", max_length=300
        )
        price: float = Field(gt=0, description="The price must be greater than zero")
        tax: Union[float, None] = None
    
    
    @app.put("/items/{item_id}")
    async def update_item(item_id: int, item: Item = Body(embed=True)):
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 561 bytes
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  3. tests/test_union_body_discriminator_annotated.py

    
    def test_union_body_discriminator_assignment(client: TestClient) -> None:
        response = client.post("/pet/assignment", json={"pet_type": "cat", "meows": 5})
        assert response.status_code == 200, response.text
        assert response.json() == {"pet_type": "cat", "meows": 5}
    
    
    def test_union_body_discriminator_annotated(client: TestClient) -> None:
        response = client.post("/pet/annotated", json={"pet_type": "dog", "barks": 3.5})
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Dec 20 15:55:38 GMT 2025
    - 7.7K bytes
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  4. docs_src/additional_status_codes/tutorial001_py310.py

    items = {"foo": {"name": "Fighters", "size": 6}, "bar": {"name": "Tenders", "size": 3}}
    
    
    @app.put("/items/{item_id}")
    async def upsert_item(
        item_id: str,
        name: str | None = Body(default=None),
        size: int | None = Body(default=None),
    ):
        if item_id in items:
            item = items[item_id]
            item["name"] = name
            item["size"] = size
            return item
        else:
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Mar 18 12:29:59 GMT 2023
    - 646 bytes
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  5. docs_src/body_fields/tutorial001_an_py39.py

    app = FastAPI()
    
    
    class Item(BaseModel):
        name: str
        description: Union[str, None] = Field(
            default=None, title="The description of the item", max_length=300
        )
        price: float = Field(gt=0, description="The price must be greater than zero")
        tax: Union[float, None] = None
    
    
    @app.put("/items/{item_id}")
    async def update_item(item_id: int, item: Annotated[Item, Body(embed=True)]):
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Mar 18 12:29:59 GMT 2023
    - 582 bytes
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  6. tests/test_openapi_schema_type.py

            "array",
            ["string", "null"],
            None,
        ],
    )
    def test_allowed_schema_type(
        type_value: Optional[Union[SchemaType, list[SchemaType]]],
    ) -> None:
        """Test that Schema accepts SchemaType, List[SchemaType] and None for type field."""
        schema = Schema(type=type_value)
        assert schema.type == type_value
    
    
    def test_invalid_type_value() -> None:
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 21:25:59 GMT 2025
    - 730 bytes
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  7. docs_src/path_operation_configuration/tutorial004_py310.py

    from fastapi import FastAPI
    from pydantic import BaseModel
    
    app = FastAPI()
    
    
    class Item(BaseModel):
        name: str
        description: str | None = None
        price: float
        tax: float | None = None
        tags: set[str] = set()
    
    
    @app.post("/items/", response_model=Item, summary="Create an item")
    async def create_item(item: Item):
        """
        Create an item with all the information:
    
        - **name**: each item must have a name
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Fri Jan 07 14:11:31 GMT 2022
    - 638 bytes
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  8. docs/es/docs/how-to/separate-openapi-schemas.md

    </div>
    
    Esto significa que **siempre tendrá un valor**, solo que a veces el valor podría ser `None` (o `null` en JSON).
    
    Eso significa que, los clientes que usan tu API no tienen que revisar si el valor existe o no, pueden **asumir que el campo siempre estará allí**, pero solo que en algunos casos tendrá el valor por defecto de `None`.
    
    La forma de describir esto en OpenAPI es marcar ese campo como **requerido**, porque siempre estará allí.
    
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Tue Dec 16 16:33:45 GMT 2025
    - 4.8K bytes
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  9. docs/pt/docs/how-to/separate-openapi-schemas.md

    </div>
    
    Isso significa que ele **sempre terá um valor**, só que às vezes o valor pode ser `None` (ou `null` em termos de JSON).
    
    Isso quer dizer que, os clientes que usam sua API não precisam verificar se o valor existe ou não, eles podem **assumir que o campo sempre estará lá**, mas que em alguns casos terá o valor padrão de `None`.
    
    A maneira de descrever isso no OpenAPI é marcar esse campo como **obrigatório**, porque ele sempre estará lá.
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Nov 12 16:23:57 GMT 2025
    - 4.8K bytes
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  10. docs/uk/docs/tutorial/response-model.md

    Ваша модель відповіді може мати значення за замовчуванням, наприклад:
    
    {* ../../docs_src/response_model/tutorial004_py310.py hl[9,11:12] *}
    
    * `description: Union[str, None] = None` (або `str | None = None` у Python 3.10) має значення за замовчуванням `None`.
    * `tax: float = 10.5` має значення за замовчуванням `10.5`.
    * `tags: List[str] = []` має значення за замовчуванням порожній список: `[]`.
    
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Tue Jun 24 19:14:01 GMT 2025
    - 24.8K bytes
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