=== "Python 3.8 and above"

    ```Python hl_lines="1  14-15  18-20  33"
    {!> ../../../docs_src/extra_models/tutorial003.py!}
    ```

=== "Python 3.10 and above"

=== "Python 3.10+"

    ```Python hl_lines="1  14-15  18-20  33"
    {!> ../../../docs_src/extra_models/tutorial003_py310.py!}
    ```

=== "Python 3.8+"

### `Union` 🐍 3️⃣.1️⃣0️⃣

👉 🖼 👥 🚶‍♀️ `Union[PlaneItem, CarItem]` 💲 ❌ `response_model`.

↩️ 👥 🚶‍♀️ ⚫️ **💲 ❌** ↩️ 🚮 ⚫️ **🆎 ✍**, 👥 ✔️ ⚙️ `Union` 🐍 3️⃣.1️⃣0️⃣.

🚥 ⚫️ 🆎 ✍ 👥 💪 ✔️ ⚙️ ⏸ ⏸,:

```Python
some_variable: PlaneItem | CarItem
```

✋️ 🚥 👥 🚮 👈 `response_model=PlaneItem | CarItem` 👥 🔜 🤚 ❌, ↩️ 🐍 🔜 🔄 🎭 **❌ 🛠️** 🖖 `PlaneItem` & `CarItem` ↩️ 🔬 👈 🆎 ✍.

## 📇 🏷

=== "Python 3.10+"

    ```Python hl_lines="1  14-15  18-20  33"
    {!> ../../../docs_src/extra_models/tutorial003_py310.py!}
    ```

!!! note "笔记"

    定义 <a href="https://docs.pydantic.dev/latest/concepts/types/#unions" class="external-link" target="_blank">`Union`</a> 类型时，要把详细的类型写在前面，然后是不太详细的类型。下例中，更详细的 `PlaneItem` 位于 `Union[PlaneItem，CarItem]` 中的 `CarItem` 之前。

=== "Python 3.10+"

    ```Python hl_lines="1  14-15  18-20  33"
    {!> ../../../docs_src/extra_models/tutorial003_py310.py!}
    ```

=== "Python 3.8+"