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  1. docs/it/docs/index.md

    ```Python hl_lines="2  7-10  23-25"
    from fastapi import FastAPI
    from pydantic import BaseModel
    from typing import Optional
    
    app = FastAPI()
    
    
    class Item(BaseModel):
        name: str
        price: float
        is_offer: bool = Optional[None]
    
    
    @app.get("/")
    def read_root():
        return {"Hello": "World"}
    
    
    @app.get("/items/{item_id}")
    def read_item(item_id: int, q: Optional[str] = None):
    Plain Text
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  2. docs/zh/docs/index.md

    ```Python hl_lines="4  9-12  25-27"
    from typing import Union
    
    from fastapi import FastAPI
    from pydantic import BaseModel
    
    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):
    Plain Text
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  3. docs/em/docs/tutorial/path-params-numeric-validations.md

    🎏 ✔:
    
    * `gt`: `g`🅾 `t`👲
    * `le`: `l`👭 🌘 ⚖️ `e`🅾
    
    ```Python hl_lines="9"
    {!../../../docs_src/path_params_numeric_validations/tutorial005.py!}
    ```
    
    ## 🔢 🔬: 🎈, 🌘 🌘 & 🌘 🌘
    
    🔢 🔬 👷 `float` 💲.
    
    📥 🌐❔ ⚫️ ▶️️ ⚠ 💪 📣 <abbr title="greater than"><code>gt</code></abbr> &amp; 🚫 <abbr title="greater than or equal"><code>ge</code></abbr>. ⏮️ ⚫️ 👆 💪 🚚, 🖼, 👈 💲 🔜 👑 🌘 `0`, 🚥 ⚫️ 🌘 🌘 `1`.
    
    Plain Text
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  4. docs/en/docs/tutorial/response-model.md

        ```Python hl_lines="11  13-14"
        {!> ../../../docs_src/response_model/tutorial004.py!}
        ```
    
    * `description: Union[str, None] = None` (or `str | None = None` in Python 3.10) has a default of `None`.
    * `tax: float = 10.5` has a default of `10.5`.
    * `tags: List[str] = []` has a default of an empty list: `[]`.
    
    but you might want to omit them from the result if they were not actually stored.
    
    Plain Text
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  5. docs/ko/docs/tutorial/body.md

    === "Python 3.8+"
    
        ```Python hl_lines="18"
        {!> ../../../docs_src/body/tutorial004.py!}
        ```
    
    함수 매개변수는 다음을 따라서 인지하게 됩니다:
    
    * 만약 매개변수가 **경로**에도 선언되어 있다면, 이는 경로 매개변수로 사용될 것입니다.
    * 만약 매개변수가 (`int`, `float`, `str`, `bool` 등과 같은) **유일한 타입**으로 되어있으면, **쿼리** 매개변수로 해석될 것입니다.
    * 만약 매개변수가 **Pydantic 모델** 타입으로 선언되어 있으면, 요청 **본문**으로 해석될 것입니다.
    
    !!! note "참고"
        FastAPI는 `q`의 값이 필요없음을 알게 될 것입니다. 기본 값이 `= None`이기 때문입니다.
    
    Plain Text
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  6. docs/fr/docs/tutorial/path-params.md

            }
        ]
    }
    ```
    
    car le paramètre de chemin `item_id` possède comme valeur `"foo"`, qui ne peut pas être convertie en entier (`int`).
    
    La même erreur se produira si vous passez un nombre flottant (`float`) et non un entier, comme ici
    <a href="http://127.0.0.1:8000/items/4.2" class="external-link" target="_blank">http://127.0.0.1:8000/items/4.2</a>.
    
    
    !!! check "vérifier"
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  7. docs/vi/docs/features.md

        * JSON objects (`dict`).
        * Mảng JSON (`list`) định nghĩa kiểu dữ liệu từng phần tử.
        * Xâu (`str`), định nghĩa độ dài lớn nhất, nhỏ nhất.
        * Số (`int`, `float`) với các giá trị lớn nhất, nhỏ nhất, etc.
    
    * Validation cho nhiều kiểu dữ liệu bên ngoài như:
        * URL.
        * Email.
        * UUID.
        * ...và nhiều cái khác.
    
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  8. docs/de/docs/tutorial/path-params-numeric-validations.md

        ```Python hl_lines="9"
        {!> ../../../docs_src/path_params_numeric_validations/tutorial005.py!}
        ```
    
    ## Validierung von Zahlen: Floats, größer und kleiner
    
    Zahlenvalidierung funktioniert auch für <abbr title="Kommazahl">`float`</abbr>-Werte.
    
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  9. docs_src/body_nested_models/tutorial007.py

    
    class Item(BaseModel):
        name: str
        description: Union[str, None] = None
        price: float
        tax: Union[float, None] = None
        tags: Set[str] = set()
        images: Union[List[Image], None] = None
    
    
    class Offer(BaseModel):
        name: str
        description: Union[str, None] = None
        price: float
        items: List[Item]
    
    
    @app.post("/offers/")
    async def create_offer(offer: Offer):
    Python
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  10. docs_src/dataclasses/tutorial001.py

    from dataclasses import dataclass
    from typing import Union
    
    from fastapi import FastAPI
    
    
    @dataclass
    class Item:
        name: str
        price: float
        description: Union[str, None] = None
        tax: Union[float, None] = None
    
    
    app = FastAPI()
    
    
    @app.post("/items/")
    async def create_item(item: Item):
    Python
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