////

Использование `str | None` вместо просто `str` позволит редактору кода помочь вам обнаружить ошибки, когда вы предполагаете, что значение всегда `str`, хотя на самом деле оно может быть и `None`.

### Классы как типы { #classes-as-types }

Вы также можете объявлять класс как тип переменной.

Допустим, у вас есть класс `Person` с именем:

{* ../../docs_src/python_types/tutorial010_py310.py hl[1:3] *}

## Advanced description from docstring { #advanced-description-from-docstring }

You can limit the lines used from the docstring of a *path operation function* for OpenAPI.

Adding an `\f` (an escaped "form feed" character) causes **FastAPI** to truncate the output used for OpenAPI at this point.

It won't show up in the documentation, but other tools (such as Sphinx) will be able to use the rest.

 *
 * @author Dimitris Andreou
 * @since 13.0
 */
// TODO(user): switch to nano precision. A natural unit of cost is "bytes", and a micro precision
// would mean a maximum rate of "1MB/s", which might be small in some cases.
@Beta
@J2ktIncompatible
@GwtIncompatible
public abstract class RateLimiter {
  /**
   * Creates a {@code RateLimiter} with the specified stable throughput, given as "permits per

  // final fields.
  //
  // For simplicity the rest of this description will discuss Futures.catching since it is the
  // simplest instance, though very similar descriptions apply to many other classes in this file.
  //
  // In the constructor of AbstractCatchingFuture, the delegate future is assigned to a field
  // 'inputFuture'. That field is non-final and non-volatile. There are 2 places where the

        assertNull(languageHelper.getSupportedLanguage(" ja "));
        assertNull(languageHelper.getSupportedLanguage("ja "));
        assertNull(languageHelper.getSupportedLanguage(" ja"));
    }

    // Mock classes
    private static class MockFessConfig extends FessConfig.SimpleImpl {
        private static final long serialVersionUID = 1L;

        @Override
        public String[] getIndexerLanguageFieldsAsArray() {

        RelatedContent entity = new RelatedContent();
        entity.setTerm(term);
        entity.setContent(content);
        entity.setVirtualHost(virtualHost);
        return entity;
    }

    // Mock classes

    static class MockRelatedContentBhv extends RelatedContentBhv {
        private List<RelatedContent> testData = new ArrayList<>();

        public void setTestData(List<RelatedContent> testData) {

                testRequest.encode(buffer, 0);
            });

            assertTrue(exception.getMessage().contains("Wrong size calculation"));
        }
    }

    // Test implementation classes
    private static class TestServerMessageBlock2Request extends ServerMessageBlock2Request<TestServerMessageBlock2Response> {
        private TestServerMessageBlock2Response testResponse;
        private int testSize = 64;

            The directory where compiled application classes are placed.
            The default value is {@code target/classes}.
          </description>
          <type>String</type>
        </field>
        <field>
          <name>testOutputDirectory</name>
          <version>4.0.0+</version>
          <description>
            The directory where compiled test classes are placed.

   * multimap based on arbitrary {@link Map} and {@link List} classes. Most users should prefer
   * {@link MultimapBuilder}, though a small number of users will need this method to cover map or
   * collection types that {@link MultimapBuilder} does not support.
   *
   * <p>The {@code factory}-generated and {@code map} classes determine the multimap iteration

   * multimap based on arbitrary {@link Map} and {@link List} classes. Most users should prefer
   * {@link MultimapBuilder}, though a small number of users will need this method to cover map or
   * collection types that {@link MultimapBuilder} does not support.
   *
   * <p>The {@code factory}-generated and {@code map} classes determine the multimap iteration