You can define an attribute to be a subtype. For example, a Python `list`:

{* ../../docs_src/body_nested_models/tutorial001_py310.py hl[12] *}

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":

	// is ignored.
	UploadIDMarker string

	// When a list is truncated, this element specifies the value that should be
	// used for the key-marker request parameter in a subsequent request.
	NextKeyMarker string

	// When a list is truncated, this element specifies the value that should be
	// used for the upload-id-marker request parameter in a subsequent request.
	NextUploadIDMarker string

     *
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        StringBuilder ret = new StringBuilder();
        for (final byte element : this.b) {
            final int n = element & 0xff;
            if (n <= 0x0f) {
                ret.append("0");
            }
            ret.append(Integer.toHexString(n));
        }
        return ret.toString();
    }

 * invoke methods, they invoke methods on the {@code ForwardingNavigableSet}.
 *
 * <p>Each of the {@code standard} methods uses the set's comparator (or the natural ordering of the
 * elements, if there is no comparator) to test element equality. As a result, if the comparator is
 * not consistent with equals, some of the standard implementations may violate the {@code Set}
 * contract.
 *

 * an artifact is being produced by a project.</p>
 *
 * <p>{@link org.apache.maven.api.DependencyCoordinates} instances represent a dependency element in a POM.
 * A {@code DependencyCoordinates} extends {@code ArtifactCoordinates} with additional information about how
 * the artifact will be used: type, scope and obligation (whether the dependency is optional or mandatory).

        if (!paramType.getRawType().isInstance(value)) {
            if (configuration.getChildCount() > 0) {
                throw new ComponentConfigurationException(
                        "Basic element '" + configuration.getName() + "' must not contain child elements");
            }
            value = convertProperty(beanType, paramType.getRawType(), paramType.getType(), configuration);
        }

        if (value != null) {
            try {

        // Verify the stack trace contains this test method
        boolean foundTestMethod = false;
        for (StackTraceElement element : exception.getStackTrace()) {
            if (element.getMethodName().equals("test_stackTrace") && element.getClassName().equals(this.getClass().getName())) {
                foundTestMethod = true;
                break;
            }
        }

        }
        final byte[] digest = msgDigest.digest();

        final StringBuilder buffer = new StringBuilder(200);
        for (final byte element : digest) {
            final String tmp = Integer.toHexString(element & 0xff);
            if (tmp.length() == 1) {
                buffer.append('0').append(tmp);
            } else {
                buffer.append(tmp);
            }
        }

     */
    ParameterizedClassDesc getParameterizedClassDesc();

    /**
     * Returns the element type if the method's parameter type at the specified index is a parameterized {@link Collection}.
     *
     * @param index
     *            the index of the parameter
     * @return the element type if the parameter type at the specified index is a parameterized {@link Collection}, otherwise {@literal null}
     */

  private M multimap;

  protected M multimap() {
    return multimap;
  }

  /**
   * @return an array of the proper size with {@code null} as the key of the middle element.
   */
  protected Entry<K, V>[] createArrayWithNullKey() {
    Entry<K, V>[] array = createSamplesArray();
    int nullKeyLocation = getNullLocation();
    Entry<K, V> oldEntry = array[nullKeyLocation];