You do that with standard modern Python types.

You don't have to learn a new syntax, the methods or classes of a specific library, etc.

Just standard **Python**.

For example, for an `int`:

```Python
item_id: int
```

or for a more complex `Item` model:

```Python
item: Item
```

Asia/Samarkand Asia/Seoul Asia/Shanghai Asia/Singapore Asia/Srednekolymsk Asia/Taipei Asia/Tashkent Asia/Tbilisi Asia/Tehran Asia/Tel_Aviv Asia/Thimbu Asia/Thimphu Asia/Tokyo Asia/Tomsk Asia/Ujung_Pandang Asia/Ulaanbaatar Asia/Ulan_Bator Asia/Urumqi Asia/Ust-Nera Asia/Vientiane Asia/Vladivostok Asia/Yakutsk Asia/Yangon Asia/Yekaterinburg Asia/Yerevan Atlantic/Azores Atlantic/Bermuda Atlantic/Canary Atlantic/Cape_Verde Atlantic/Faeroe Atlantic/Faroe Atlantic/Jan_Mayen Atlantic/Madeira Atlantic/Reykjavik...

	if err != nil {
		return nil, nil, err
	}

	return lookupRes, groups, nil
}

// GetValidatedDNForUsername checks if the given username exists in the LDAP directory.
// The given username could be just the short "login" username or the full DN.
//
// When the username/DN is found, the full DN returned by the **server** is
// returned, otherwise the returned string is empty. The value returned here is

**FastAPI** generates a "schema" with all your API using the **OpenAPI** standard for defining APIs.

#### "Schema" { #schema }

A "schema" is a definition or description of something. Not the code that implements it, but just an abstract description.

#### API "schema" { #api-schema }

     */
    private static Class<?> loadImplementation(final String name, final Class<?> defaultClazz) {
        if (null == name) {
            return defaultClazz; // just use the default type
        }

        // TCCL allows surrounding container to influence class loading policy
        final ClassLoader tccl = Thread.currentThread().getContextClassLoader();
        if (tccl != null) {

    private final ProjectsSelector projectsSelector = new DefaultProjectsSelector(projectBuilder);

    // Not using mocks for these strategies - a mock would just copy the actual implementation.

    private final ModelProcessor modelProcessor = new DefaultModelProcessor(null, Map.of());

 * https://maven.apache.org/developers/mojo-api-specification.html</a>
 *
 * TODO is there a need for the delegation of MavenMojoDescriptor to this?
 * Why not just extend ComponentDescriptor here?
 */
public class MojoDescriptor extends ComponentDescriptor<Mojo> implements Cloneable {
    /** The Plexus component type */
    public static final String MAVEN_PLUGIN = "maven-plugin";

            throws ModelBuilderException {
        ModelBuilderResult result = buildModel(session, src);
        Model model = result.getRawModel();
        // For BOMs without flattening, we just need to transform the packaging from "bom" to "pom"
        // but keep everything else from the raw model (including unresolved versions)
        return transformBom(model, project);
    }

http://localhost:8000/items/
```

значение по умолчанию для `q` будет: `["foo", "bar"]`, и ответом будет:

```JSON
{
  "q": [
    "foo",
    "bar"
  ]
}
```

#### Просто `list` { #using-just-list }

Можно использовать `list` напрямую вместо `list[str]`:

{* ../../docs_src/query_params_str_validations/tutorial013_an_py39.py hl[9] *}

/// note | Технические детали

### Using context managers in dependencies with `yield` { #using-context-managers-in-dependencies-with-yield }

/// warning

This is, more or less, an "advanced" idea.

If you are just starting with **FastAPI** you might want to skip it for now.

///