{!> ../../docs_src/body_nested_models/tutorial002.py!}
```

### Declare a `list` with a type parameter

To declare types that have type parameters (internal types), like `list`, `dict`, `tuple`:

* If you are in a Python version lower than 3.9, import their equivalent version from the `typing` module
* Pass the internal type(s) as "type parameters" using square brackets: `[` and `]`

In Python 3.9 it would be:

```Python

pkg reflect, func SliceAt(Type, unsafe.Pointer, int) Value #61308
pkg reflect, method (Value) Seq() iter.Seq[Value] #66056
pkg reflect, method (Value) Seq2() iter.Seq2[Value, Value] #66056
pkg reflect, type Type interface, CanSeq() bool #66056
pkg reflect, type Type interface, CanSeq2() bool #66056
pkg reflect, type Type interface, OverflowComplex(complex128) bool #60427
pkg reflect, type Type interface, OverflowFloat(float64) bool #60427

		return errors.New("value is not valid utf-8")
	}
	// Fallback to string
	v.setString(asString)
	return
}

// When numeric types are compared, type promotions could happen. If
// values do not have types (e.g. when reading from CSV), for
// comparison operations, automatic type conversion happens by trying
// to check if the value is a number (first an integer, then a float),
// and falling back to string.

    for (Type type : types) {
      if (type == null || !visited.add(type)) {
        // null owner type, or already visited;
        continue;
      }
      boolean succeeded = false;
      try {
        if (type instanceof TypeVariable) {
          visitTypeVariable((TypeVariable<?>) type);
        } else if (type instanceof WildcardType) {
          visitWildcardType((WildcardType) type);

</p>


<h2 id="Types">Types</h2>

<p>
A type determines a set of values together with operations and methods specific
to those values. A type may be denoted by a <i>type name</i>, if it has one, which must be
followed by <a href="#Instantiations">type arguments</a> if the type is generic.
A type may also be specified using a <i>type literal</i>, which composes a type
from existing types.
</p>

            Type type = types.get(id);
            if (type == null) {
                // Copy data as the ArtifactHandler is not immutable, but Type should be.
                ArtifactHandler handler = manager.getArtifactHandler(id);
                type = new DefaultType(
                        id,
                        languageRegistry.lookup(handler.getLanguage()).orElseGet(() -> handler::getLanguage),
                        handler.getExtension(),

pkg go/types, method (*Interface) EmbeddedTypes() iter.Seq[Type] #66626
pkg go/types, method (*Interface) ExplicitMethods() iter.Seq[*Func] #66626
pkg go/types, method (*Interface) Methods() iter.Seq[*Func] #66626
pkg go/types, method (*MethodSet) Methods() iter.Seq[*Selection] #66626
pkg go/types, method (*Named) Methods() iter.Seq[*Func] #66626
pkg go/types, method (*Scope) Children() iter.Seq[*Scope] #66626
pkg go/types, method (*Struct) Fields() iter.Seq[*Var] #66626

{* ../../docs_src/body/tutorial001.py hl[18] *}

...et déclarez que son type est le modèle que vous avez créé : `Item`.

## Résultats

En utilisant uniquement les déclarations de type Python, **FastAPI** réussit à :

* Lire le contenu de la requête en tant que JSON.
* Convertir les types correspondants (si nécessaire).
* Valider la donnée.

	}
	return string(stdout), string(stderr)
}

// A typeConv is a translator from dwarf types to Go types
// with equivalent memory layout.
type typeConv struct {
	// Cache of already-translated or in-progress types.
	m map[string]*Type

	// Map from types to incomplete pointers to those types.
	ptrs map[string][]*Type
	// Keys of ptrs in insertion order (deterministic worklist)

                        "type": "string"
                    },
                    "type": {
                        "title": "Error Type",
                        "type": "string"
                    }
                }
            },
            "HTTPValidationError": {
                "title": "HTTPValidationError",
                "type": "object",
                "properties": {