///

## Inclure un paramètre imbriqué dans le body

Disons que vous avez seulement un paramètre `item` dans le body, correspondant à un modèle Pydantic `Item`.

Par défaut, **FastAPI** attendra sa déclaration directement dans le body.

    return accessibleObject.getDeclaredAnnotations();
  }

  // We ought to be able to implement GenericDeclaration instead its parent AnnotatedElement.
  // That would give us this method declaration. But for some reason, implementing
  // GenericDeclaration leads to weird errors in Android tests:
  // IncompatibleClassChangeError: interface not implemented

* **Easy**: Designed to be easy to use and learn. Less time reading docs.
* **Short**: Minimize code duplication. Multiple features from each parameter declaration. Fewer bugs.
* **Robust**: Get production-ready code. With automatic interactive documentation.

![ReDoc](https://fastapi.tiangolo.com/img/index/index-06-redoc-02.png)

### فقط پایتون مدرن

همه اینها برپایه type declaration های **پایتون ۳.۶** استاندارد (به لطف Pydantic) میباشند. سینتکس جدیدی درکار نیست. تنها پایتون مدرن استاندارد.

    "tax": 3.2,
    "tags": ["rock", "metal", "bar"],
    "image": {
        "url": "http://example.com/baz.jpg",
        "name": "The Foo live"
    }
}
```

Again, doing just that declaration, with **FastAPI** you get:

* Editor support (completion, etc.), even for nested models
* Data conversion
* Data validation
* Automatic documentation

## Special types and validation

///

### <a href="https://github.com/hugapi/hug" class="external-link" target="_blank">Hug</a>

{* ../../docs_src/body/tutorial001_py310.py hl[16] *}

...and declare its type as the model you created, `Item`.

## Results

With just that Python type declaration, **FastAPI** will:

* Read the body of the request as JSON.
* Convert the corresponding types (if needed).
* Validate the data.

+++ b/misc/sys/cdefs.h
@@ -423,4 +423,14 @@
 # endif
 #endif
 
+/* Undefine (also defined in libc-symbols.h).  */
+#undef __attribute_copy__
+#if __GNUC_PREREQ (9, 0)
+/* Copies attributes from the declaration or type referenced by
+   the argument.  */
+# define __attribute_copy__(arg) __attribute__ ((__copy__ (arg)))
+#else
+# define __attribute_copy__(arg)
+#endif
+
 #endif	 /* sys/cdefs.h */

  revive:
    ignore-generated-header: false
    severity: "warning"
    confidence: 0.0
    rules:
      - name: blank-imports
      - name: context-keys-type
      - name: time-naming
      - name: var-declaration
      - name: unexported-return
      - name: errorf
      - name: context-as-argument
      - name: dot-imports
      - name: error-return
      - name: error-strings
      - name: error-naming

à :

```Python
    first_name: str, last_name: str
```

C'est tout.

Ce sont des annotations de types :

{*../../docs_src/python_types/tutorial002.py hl[1] *}

À ne pas confondre avec la déclaration de valeurs par défaut comme ici :

```Python
    first_name="john", last_name="doe"
```

C'est une chose différente.

On utilise un deux-points (`:`), et pas un égal (`=`).