### Advertencia sobre el reemplazo { #warning-about-replacing }

Esto significa que si quieres actualizar el ítem `bar` usando `PUT` con un body que contenga:

```Python
{
    "name": "Barz",
    "price": 3,
    "description": None,
}
```

debido a que no incluye el atributo ya almacenado `"tax": 20.2`, el modelo de entrada tomaría el valor por defecto de `"tax": 10.5`.

```Python hl_lines="2  7-10 23-25"
from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    price: float
    is_offer: bool | None = None


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):

/usr/bin/$VERSION get-pip.py
/usr/bin/$VERSION -m pip install --no-cache-dir --upgrade pip
/usr/bin/$VERSION -m pip install -U setuptools


# For Python 3.13t, do not install twine as it does not have pre-built wheels
# for this Python version and building it from source fails. We only need twine
# to be present on the system Python which in this case is 3.12.
# Same reason for Python 3.14.

```Python hl_lines="2  7-10 23-25"
from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    price: float
    is_offer: bool | None = None


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str | None = None):

        this.phases = registry.computePhases(lifecycle);
        this.defaultPhases = getDefaultPhases(lifecycle);
    }

    // <lifecycle>
    //   <id>clean</id>
    //   <phases>
    //     <phase>pre-clean</phase>
    //     <phase>clean</phase>
    //     <phase>post-clean</phase>
    //   </phases>
    //   <default-phases>
    //     <clean>org.apache.maven.plugins:maven-clean-plugin:clean</clean>

 * It can identify areas where string deduplication could provide significant memory savings.</p>
 *
 * <p>Usage example:</p>
 * <pre>
 * PomMemoryAnalyzer analyzer = new PomMemoryAnalyzer();
 * Model model = reader.read(Files.newInputStream(pomPath));
 * analyzer.analyzePom(model);
 * analyzer.printAnalysis();
 * </pre>
 *
 * <p>The analysis output includes:</p>
 * <ul>
 *   <li>Total memory usage per POM path</li>

### Créer une classe `GzipRequest` personnalisée { #create-a-custom-gziprequest-class }

/// tip | Astuce

Il s'agit d'un exemple simplifié pour montrer le fonctionnement ; si vous avez besoin de la prise en charge de Gzip, vous pouvez utiliser le [`GzipMiddleware`](../advanced/middleware.md#gzipmiddleware) fourni.

///

{* ../../docs_src/body_updates/tutorial001_py310.py hl[28:33] *}

`PUT` 用于接收替换现有数据的数据。

### 关于替换的警告 { #warning-about-replacing }

用 `PUT` 把数据项 `bar` 更新为以下请求体时：

```Python
{
    "name": "Barz",
    "price": 3,
    "description": None,
}
```

因为其中未包含已存储的属性 `"tax": 20.2`，输入模型会取 `"tax": 10.5` 的默认值。

因此，保存的数据会带有这个“新的” `tax` 值 `10.5`。

## 用 `PATCH` 进行部分更新 { #partial-updates-with-patch }

现在你可以导入并使用客户端代码了。它可能是这样，并且你会发现方法有自动补全：

<img src="/img/tutorial/generate-clients/image02.png">

要发送的载荷也会有自动补全：

<img src="/img/tutorial/generate-clients/image03.png">

/// tip | 提示

请注意 `name` 和 `price` 的自动补全，它们是在 FastAPI 应用中的 `Item` 模型里定义的。

///

你发送的数据如果不符合要求，会在编辑器中显示内联错误：

<img src="/img/tutorial/generate-clients/image04.png">

响应对象同样有自动补全：

<img src="/img/tutorial/generate-clients/image05.png">

   * the "next" pointer (pointing to the next entry in the bucket chain), which will always be less
   * than or equal to the hashtable mask.
   *
   * <pre>
   * hash  = aaaaaaaa
   * mask  = 00000fff
   * next  = 00000bbb
   * entry = aaaaabbb
   * </pre>
   *
   * <p>The pointers in [size(), entries.length) are all "null" (UNSET).
   */
  @VisibleForTesting transient int @Nullable [] entries;

  /**