///

{* ../../docs_src/extra_models/tutorial003_py310.py hl[1,14:15,18:20,33] *}

### `Union` in Python 3.10 { #union-in-python-3-10 }

In this example we pass `Union[PlaneItem, CarItem]` as the value of the argument `response_model`.

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class BaseItem(BaseModel):
    description: str
    type: str


class CarItem(BaseItem):
    type: str = "car"


class PlaneItem(BaseItem):
    type: str = "plane"
    size: int


items = {
    "item1": {"description": "All my friends drive a low rider", "type": "car"},
    "item2": {

///

{* ../../docs_src/extra_models/tutorial003_py310.py hl[1,14:15,18:20,33] *}

### `Union` en Python 3.10 { #union-in-python-3-10 }

En este ejemplo pasamos `Union[PlaneItem, CarItem]` como el valor del argumento `response_model`.

///

{* ../../docs_src/extra_models/tutorial003_py310.py hl[1,14:15,18:20,33] *}

### `Union` у Python 3.10 { #union-in-python-3-10 }

У цьому прикладі ми передаємо `Union[PlaneItem, CarItem]` як значення аргументу `response_model`.

///

{* ../../docs_src/extra_models/tutorial003_py310.py hl[1,14:15,18:20,33] *}

### `Union` en Python 3.10 { #union-in-python-3-10 }

Dans cet exemple, nous passons `Union[PlaneItem, CarItem]` comme valeur de l'argument `response_model`.

///

{* ../../docs_src/extra_models/tutorial003_py310.py hl[1,14:15,18:20,33] *}

### Python 3.10 中的 `Union` { #union-in-python-3-10 }

在这个示例中，我们把 `Union[PlaneItem, CarItem]` 作为参数 `response_model` 的值传入。

因为这是作为“参数的值”而不是放在“类型注解”中，所以即使在 Python 3.10 也必须使用 `Union`。