while (interfaces.hasMoreElements()) {
                NetworkInterface ni = interfaces.nextElement();

                if (!ni.isUp() || ni.isLoopback() || ni.isVirtual()) {
                    continue;
                }

                Enumeration<InetAddress> addresses = ni.getInetAddresses();
                while (addresses.hasMoreElements()) {

Dans cet exemple, la fonction de tâche écrira dans un fichier (afin de simuler un envoi d'email).

L'opération d'écriture n'utilisant ni `async` ni `await`, on définit la fonction avec un `def` normal.

{* ../../docs_src/background_tasks/tutorial001.py hl[6:9] *}

## Ajouter une tâche d'arrière-plan

  }

  public void testComposition() {
    Map<String, Integer> mJapaneseToInteger = new HashMap<>();
    mJapaneseToInteger.put("Ichi", 1);
    mJapaneseToInteger.put("Ni", 2);
    mJapaneseToInteger.put("San", 3);
    Function<String, Integer> japaneseToInteger = Functions.forMap(mJapaneseToInteger);

    Map<Integer, String> mIntegerToSpanish = new HashMap<>();

emo?naripi?oy??hskihs?i&dem!.remarf,?hs?k!on??sa!.&nomead,snduolc,xid,???jnin?k&aso?dov?ede?usto??l!.&gro?moc?ofni?r&ep?nb,?t&en?ni??ude?vog??irgnahs?le&nisiuc?rbmuder???m!.&ca?gro?oc?sserp?ten?vog??ahokoy?e00sf7vqn--nx?m??n!.&gro?moc?oc?t&en?la??vog??av?is?olecrab?tea??p!.&bog?ca?d&em?ls??g&ni?ro??mo&c?n??oba?ten?ude??c?g7hyabgm--nx?ra!.&461e?6pi?emoh?iru?nru?rdda-ni?siri???s??q!.&eman?gro?hcs?lim?moc?ten?ude?vog???r&az?emac?f4a3abgm--nx?n!d5uhf8le58r4w--nx??ukas??s!.&bup?dem?gro?hcs?moc?ten?ud...

            
            while (interfaces.hasMoreElements()) {
                NetworkInterface ni = interfaces.nextElement();
                
                if (!ni.isUp() || ni.isLoopback() || ni.isVirtual()) {
                    continue;
                }
                
                Enumeration<InetAddress> addresses = ni.getInetAddresses();
                while (addresses.hasMoreElements()) {

Podrías hacer eso con `openapi_extra`:

{* ../../docs_src/path_operation_advanced_configuration/tutorial006_py39.py hl[19:36, 39:40] *}

En este ejemplo, no declaramos ningún modelo Pydantic. De hecho, el cuerpo del request ni siquiera se <abbr title="convertido de algún formato plano, como bytes, a objetos de Python">parse</abbr> como JSON, se lee directamente como `bytes`, y la función `magic_data_reader()` sería la encargada de parsearlo de alguna manera.

    }

    private boolean checkRSSCapability() {
        // Platform-specific RSS detection - simplified implementation
        try {
            NetworkInterface ni = NetworkInterface.getByInetAddress(address);
            return ni != null && ni.supportsMulticast();
        } catch (SocketException e) {
            return false;
        }
    }

    @Override
    public String toString() {

/// tip | İpucu

**FastAPI**'ı düzgün (ve önerilen) şekilde öğrenmek istiyorsanız [Öğretici - Kullanıcı Rehberi](../tutorial/index.md){.internal-link target=_blank}'ni bölüm bölüm okuyun.

        try {
            List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
            interfaces.removeIf(ni -> {
                try {
                    return ni.isLoopback() || !ni.isUp() || ni.isVirtual();
                } catch (Exception e) {
                    return true;
                }
            });
            return interfaces;

  }

  public void testComposition() {
    Map<String, Integer> mJapaneseToInteger = new HashMap<>();
    mJapaneseToInteger.put("Ichi", 1);
    mJapaneseToInteger.put("Ni", 2);
    mJapaneseToInteger.put("San", 3);
    Function<String, Integer> japaneseToInteger = Functions.forMap(mJapaneseToInteger);

    Map<Integer, String> mIntegerToSpanish = new HashMap<>();