!!! note
    When defining a <a href="https://docs.pydantic.dev/latest/concepts/types/#unions" class="external-link" target="_blank">`Union`</a>, include the most specific type first, followed by the less specific type. In the example below, the more specific `PlaneItem` comes before `CarItem` in `Union[PlaneItem, CarItem]`.

=== "Python 3.10+"

    ```Python hl_lines="1  14-15  18-20  33"

        That's a lot of work they are doing, but if more FastAPI users came to help others like them just a little bit more, it would be much less effort for them (and you and me 😅).

        By asking questions in a structured way (following this) it will be much easier to help you.

数值校验同样适用于 `float` 值。

能够声明 <abbr title="大于"><code>gt</code></abbr> 而不仅仅是 <abbr title="大于等于"><code>ge</code></abbr> 在这个前提下变得重要起来。例如，你可以要求一个值必须大于 `0`，即使它小于 `1`。

因此，`0.5` 将是有效值。但是 `0.0`或 `0` 不是。

对于 <abbr title="less than"><code>lt</code></abbr> 也是一样的。

```Python hl_lines="11"
{!../../../docs_src/path_params_numeric_validations/tutorial006.py!}
```

## 总结

    ```

## Number validations: floats, greater than and less than

Number validations also work for `float` values.

Here's where it becomes important to be able to declare <abbr title="greater than"><code>gt</code></abbr> and not just <abbr title="greater than or equal"><code>ge</code></abbr>. As with it you can require, for example, that a value must be greater than `0`, even if it is less than `1`.

!!! note
    `PATCH` is less commonly used and known than `PUT`.

    And many teams use only `PUT`, even for partial updates.

    You are **free** to use them however you want, **FastAPI** doesn't impose any restrictions.

    But this guide shows you, more or less, how they are intended to be used.

### Using Pydantic's `exclude_unset` parameter

✋️ ⚫️ 🚫 ✔️ `id` 🏑.

👥 ✍ 🆕 `dict`, 👈 🔌 🔑-💲 👫 ⚪️➡️ `note.dict()` ⏮️:

```Python
{**note.dict()}
```

`**note.dict()` "unpacks" the key value pairs directly, so, `{**note.dict()}` would be, more or less, a copy of `note.dict()`.

& ⤴️, 👥 ↔ 👈 📁 `dict`, ❎ ➕1️⃣ 🔑-💲 👫: `"id": last_record_id`:

```Python
{**note.dict(), "id": last_record_id}
```

, 🏁 🏁 📨 🔜 🕳 💖:

```Python
{

Assim, `0.5` seria um valor válido. Mas `0.0` ou `0` não seria.

E o mesmo para <abbr title="less than"><code>lt</code></abbr>.

```Python hl_lines="11"
{!../../../docs_src/path_params_numeric_validations/tutorial006.py!}
```

## Recapitulando