}
      };

  enum NullListener implements RemovalListener<Object, Object> {
    INSTANCE;

    @Override
    public void onRemoval(RemovalNotification<Object, Object> notification) {}
  }

  enum OneWeigher implements Weigher<Object, Object> {
    INSTANCE;

    @Override
    public int weigh(Object key, Object value) {
      return 1;
    }
  }

## Установка зависимостей { #install-dependencies }

Убедитесь, что вы создали [виртуальное окружение](../virtual-environments.md){.internal-link target=_blank}, активировали его и установили `jinja2`:

<div class="termy">

```console
$ pip install jinja2

---> 100%
```

</div>

## Использование `Jinja2Templates` { #using-jinja2templates }

    for (Constructor<X> constructor : preferringStringsThenThrowables(constructors)) {
      X instance = newFromConstructor(constructor, cause);
      if (instance != null) {
        if (instance.getCause() == null) {
          instance.initCause(cause);
        }
        return instance;
      }
    }
    throw new IllegalArgumentException(
        "No appropriate constructor for exception of type "

  <version>0.0.0.0</version>
</parent>
    ]]></configuration>
    <description> This is the MavenProject instance for the parent of the current POM.
    </description>
  </expression>
  <expression>
    <syntax>project.file</syntax>
    <description> This is the File instance that refers to the location of the current POM on
      disk.
    </description>
  </expression>
  <expression>

class GradleWrapperMain { public static void main(String[]); } org/gradle/wrapper/Install$1.class package org.gradle.wrapper; public final class Install$1 implements java.util.concurrent.Callable { public void Install$1(java.io.File, java.io.File, java.net.URI, Install, WrapperConfiguration); public final Object call(); } org/gradle/wrapper/Install$InstallCheck.class package org.gradle.wrapper; public final class Install$InstallCheck { public final java.io.File gradleHome; public final String failureMessage;...

Sie können die *Pfadoperationen* für dieses Modul mit `APIRouter` erstellen.

### `APIRouter` importieren { #import-apirouter }

Sie importieren ihn und erstellen eine „Instanz“ auf die gleiche Weise wie mit der Klasse `FastAPI`:

{* ../../docs_src/bigger_applications/app_an_py39/routers/users.py hl[1,3] title["app/routers/users.py"] *}

 * consumption at the price of moderately increased constant factors of CPU. Only use this class
 * when there is a specific reason to prioritize memory over CPU.
 *
 * @author Louis Wasserman
 */
@GwtIncompatible // not worth using in GWT for now
final class CompactLinkedHashSet<E extends @Nullable Object> extends CompactHashSet<E> {

  /** Creates an empty {@code CompactLinkedHashSet} instance. */

 * consumption at the price of moderately increased constant factors of CPU. Only use this class
 * when there is a specific reason to prioritize memory over CPU.
 *
 * @author Louis Wasserman
 */
@GwtIncompatible // not worth using in GWT for now
final class CompactLinkedHashSet<E extends @Nullable Object> extends CompactHashSet<E> {

  /** Creates an empty {@code CompactLinkedHashSet} instance. */

# In case of running on EC2
# - we add a TeamCity tag to the build with an instance type of the EC2 instance.
# - we set GRADLE_RO_DEP_CACHE to '/opt/gradle-cache' if the folder exists.

exit_if_not_on_ec2_instance

# TAG
EC2_INSTANCE_TYPE=$(curl -s "http://169.254.169.254/latest/meta-data/instance-type")
echo "##teamcity[addBuildTag 'ec2-instance-type=$EC2_INSTANCE_TYPE']"

/// info

To receive uploaded files and/or form data, first install <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">`python-multipart`</a>.

Make sure you create a [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and then install it, for example:

```console
$ pip install python-multipart
```

///