To add it to your *path operation*, declare it the same way you declared path and query parameters:

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

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

## Results { #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.

// Error implements Error interface
func (b BatchJobYamlErr) Error() string {
	return fmt.Sprintf("%s\n Hint: error near line: %d, col: %d", b.msg, b.line, b.col)
}

// BatchJobKV is a key-value data type which supports wildcard matching
type BatchJobKV struct {
	line, col int
	Key       string `yaml:"key" json:"key"`
	Value     string `yaml:"value" json:"value"`
}

var _ yaml.Unmarshaler = &BatchJobKV{}

This will make `tags` be a list, although it doesn't declare the type of the elements of the list.

## List fields with type parameter { #list-fields-with-type-parameter }

But Python has a specific way to declare lists with internal types, or "type parameters":

### Import typing's `List` { #import-typings-list }

In Python 3.9 and above you can use the standard `list` to declare these type annotations as we'll see below. 💡

        .body(
          """
          |data: hey
          |
          |
          """.trimMargin(),
        ).setHeader("content-type", "text/plain")
        .build(),
    )
    newEventSource()
    listener.assertFailure("Invalid content-type: text/plain")
  }

  @Test
  fun badResponseCode() {
    server.enqueue(
      MockResponse
        .Builder()
        .body(

 * </pre>
 */

public class SID extends rpc.sid_t {

    /**
     * SID type indicating no type information.
     */
    public static final int SID_TYPE_USE_NONE = lsarpc.SID_NAME_USE_NONE;
    /**
     * SID type indicating a user account.
     */
    public static final int SID_TYPE_USER = lsarpc.SID_NAME_USER;
    /**
     * SID type indicating a domain group.
     */

pkg io/fs, method (FileMode) Type() FileMode
pkg io/fs, type DirEntry interface { Info, IsDir, Name, Type }
pkg io/fs, type DirEntry interface, Info() (FileInfo, error)
pkg io/fs, type DirEntry interface, IsDir() bool
pkg io/fs, type DirEntry interface, Name() string
pkg io/fs, type DirEntry interface, Type() FileMode
pkg io/fs, type FS interface { Open }
pkg io/fs, type FS interface, Open(string) (File, error)

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

  private static <T> void setImplementation(Class<T> type, Class<? extends T> implementation) {
    checkArgument(type != implementation, "Don't register %s to itself!", type);
    checkArgument(
        !DEFAULTS.containsKey(type), "A default value was already registered for %s", type);
    checkArgument(
        implementations.put(type, implementation) == null,
        "Implementation for %s was already registered",

	</main>
	<jsp:include page="../footer.jsp" />
	<input type="hidden" id="contextPath" value="${pageContext.request.contextPath}" />
	<script type="text/javascript" src="${fe:url('/js/jquery-3.7.1.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/clipboard.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/popper.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/bootstrap.min.js')}"></script>

	</main>
	<jsp:include page="../footer.jsp" />
	<input type="hidden" id="contextPath" value="${pageContext.request.contextPath}" />
	<script type="text/javascript" src="${fe:url('/js/jquery-3.7.1.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/clipboard.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/popper.min.js')}"></script>
	<script type="text/javascript" src="${fe:url('/js/bootstrap.min.js')}"></script>