...es lo que **FastAPI** utilizará realmente para saber cuál es la dependencia.

Es a partir de este que **FastAPI** extraerá los parámetros declarados y es lo que **FastAPI** realmente llamará.

---

En este caso, el primer `CommonQueryParams`, en:

//// tab | Python 3.9+

```Python
commons: Annotated[CommonQueryParams, ...
```

////

//// tab | Python 3.9+ sin `Annotated`

/// tip | Consejo

* declarar el parámetro de path `item_id` usando `Path`
* tenerlos en un orden diferente
* no usar `Annotated`

...Python tiene una sintaxis especial para eso.

Pasa `*`, como el primer parámetro de la función.

*  `prices` değişkeni `dict` tipindedir:
    *  `dict` değişkeninin `key` değeri  `str` tipindedir (herbir item'ın "name" değeri).
    *  `dict` değişkeninin `value` değeri `float` tipindedir (lherbir item'ın "price" değeri).

#### `Optional`

`Optional` bir değişkenin `str`gibi bir tipi olabileceğini ama isteğe bağlı olarak tipinin `None` olabileceğini belirtir:

```Python hl_lines="1  4"

 *
 * <p>This class should not be assumed to be universally superior to {@code
 * java.util.LinkedHashSet}. Generally speaking, this class reduces object allocation and memory
 * consumption at the price of moderately increased constant factors of CPU. Only use this class
 * when there is a specific reason to prioritize memory over CPU.
 *
 * @author Louis Wasserman
 */
@GwtIncompatible // not worth using in GWT for now

 *
 * <p>This class should not be assumed to be universally superior to {@code
 * java.util.LinkedHashSet}. Generally speaking, this class reduces object allocation and memory
 * consumption at the price of moderately increased constant factors of CPU. Only use this class
 * when there is a specific reason to prioritize memory over CPU.
 *
 * @author Louis Wasserman
 */
@GwtIncompatible // not worth using in GWT for now

Por ejemplo, cuando escribes `python` en la terminal, el sistema operativo busca un programa llamado `python` en el **primer directorio** de esa lista.

Si lo encuentra, entonces lo **utilizará**. De lo contrario, continúa buscando en los **otros directorios**.

Avec **FastAPI** vous aurez toutes les fonctionnalités de **Pydantic**  (comme FastAPI est basé sur Pydantic pour toutes les manipulations de données):

* **Pas de prise de tête**:
    * Pas de nouveau langage de définition de schéma à apprendre.
    * Si vous connaissez le typage en python vous savez comment utiliser Pydantic.

{* ../../docs_src/body_updates/tutorial001.py hl[30,31,32,33,34,35] *}

既存のデータを置き換えるべきデータを受け取るために`PUT`は使用されます。

### 置換についての注意

つまり、`PUT`を使用して以下のボディで項目`bar`を更新したい場合は:

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

すでに格納されている属性`"tax": 20.2`を含まないため、入力モデルのデフォルト値は`"tax": 10.5`です。

そして、データはその「新しい」`10.5`の`tax`と共に保存されます。

## `PATCH`による部分的な更新

 *
 * <p>This class should not be assumed to be universally superior to {@code
 * java.util.LinkedHashMap}. Generally speaking, this class reduces object allocation and memory
 * consumption at the price of moderately increased constant factors of CPU. Only use this class
 * when there is a specific reason to prioritize memory over CPU.
 *
 * @author Louis Wasserman
 */

	{"X1", "X1"},
	{"X2", "X2"},
	{"X3", "X3"},
	{"X4", "X4"},
	{"X5", "X5"},
	{"X6", "X6"},
	{"X7", "X7"},
	{"asmcgocall<>(SB)", "asmcgocall<>(SB)"},
	{"ax+4(FP)", "ax+4(FP)"},
	{"ptime-12(SP)", "ptime-12(SP)"},
	{"runtime·_NtWaitForSingleObject(SB)", "runtime._NtWaitForSingleObject(SB)"},
	{"s(FP)", "s(FP)"},
	{"sec+4(FP)", "sec+4(FP)"},
	{"shifts<>(SB)(CX*8)", "shifts<>(SB)(CX*8)"},
	{"x+4(FP)", "x+4(FP)"},