Porque el editor conoce los tipos de las variables, no solo obtienes autocompletado, también obtienes chequeo de errores:

<img src="/img/python-types/image04.png">

Ahora sabes que debes corregirlo, convertir `age` a un string con `str(age)`:

{* ../../docs_src/python_types/tutorial004.py hl[2] *}

## Declaración de tipos

Acabas de ver el lugar principal para declarar anotaciones de tipos. Como parámetros de función.

        // Set a test time using reflection
        long testTime = System.currentTimeMillis();
        setFieldValue(response, "lastWriteTime", testTime);

        // All time methods should return the same converted time
        long expectedTime = testTime + serverTimeZoneOffset;
        assertEquals(expectedTime, response.getCreateTime());
        assertEquals(expectedTime, response.getLastWriteTime());

    }

    /**
     * Creates an EditBody from a DataConfig entity for API responses.
     * Handles permission and virtual host encoding.
     *
     * @param entity the DataConfig entity to convert
     * @return the converted EditBody object
     */
    protected EditBody createEditBody(final DataConfig entity) {
        final EditBody body = new EditBody();
        copyBeanToBean(entity, body, copyOp -> {

        monitorTarget.append(buf, "dateKey", supplier);
        String result = buf.toString();
        assertTrue(result.startsWith("\"dateKey\":\""));
        // Check that the date was converted to string and properly escaped
        assertTrue(result.contains("2021") || result.contains("Jan") || result.contains("1609459200000"));
    }

    // Test appendTimestamp method

    }

    @Test
    @DisplayName("available() wraps SmbException to IOException")
    void available_wrapsException() throws Exception {
        // Verify exceptions from th.send are converted to IOException via seToIoe
        SmbPipeInputStream stream = newStreamWithMinimalStubs(true);

        when(handle.ensureOpen()).thenReturn(fd);
        when(fd.getTree()).thenReturn(tree);

s)if(s[i]&&s[i].test(r)){u.unshift(i);break}if(u[0]in n)o=u[0];else{for(i in n){if(!u[0]||e.converters[i+" "+u[0]]){o=i;break}a||(a=i)}o=o||a}if(o)return o!==u[0]&&u.unshift(o),n[o]}(v,T,n)),!i&&-1<ce.inArray("script",v.dataTypes)&&ce.inArray("json",v.dataTypes)<0&&(v.converters["text script"]=function(){}),s=function(e,t,n,r){var i,o,a,s,u,l={},c=e.dataTypes.slice();if(c[1])for(a in e.converters)l[a.toLowerCase()]=e.converters[a];o=c.shift();while(o)if(e.responseFields[o]&&(n[e.responseFields[o]]=t),!u&&r&...

...et déclarez que son type est le modèle que vous avez créé : `Item`.

## Résultats

En utilisant uniquement les déclarations de type Python, **FastAPI** réussit à :

* Lire le contenu de la requête en tant que JSON.
* Convertir les types correspondants (si nécessaire).
* Valider la donnée.
    * Si la donnée est invalide, une erreur propre et claire sera renvoyée, indiquant exactement où était la donnée incorrecte.

   * (NCR). Any non-ASCII characters appearing in the input will be preserved in the output.
   * Specifically "\r" (carriage return) is preserved in the output, which may result in it being
   * silently converted to "\n" when the XML is parsed.
   *
   * <p>This escaper does not treat surrogate pairs specially and does not perform Unicode
   * validation on its input.
   */
  public static Escaper xmlContentEscaper() {

    * Formulieren.
    * Bestanden.
* <abbr title="ook bekend als: serialisatie, parsing, marshalling">Conversie</abbr> van uitvoergegevens: converstie van Python-data en -types naar netwerkgegevens (zoals JSON):
    * Converteer Python types (`str`, `int`, `float`, `bool`, `list`, etc).
    * `datetime` objecten.
    * `UUID` objecten.
    * Database modellen.
    * ...en nog veel meer.

                });
    }

    /**
     * Creates an EditBody from a SynonymItem entity for API responses.
     *
     * @param entity the SynonymItem entity to convert
     * @param dictId the dictionary ID
     * @return the converted EditBody object
     */
    protected EditBody createEditBody(final SynonymItem entity, final String dictId) {
        final EditBody body = new EditBody();