* Ensures the truth of an expression involving one or more parameters to the calling method.
   *
   * @param expression a boolean expression
   * @param errorMessage the exception message to use if the check fails; will be converted to a
   *     string using {@link String#valueOf(Object)}
   * @throws IllegalArgumentException if {@code expression} is false
   */
  public static void checkArgument(boolean expression, @Nullable Object errorMessage) {

   * of @JsMethod is to make a method *callable* from JavaScript and (b) this method would not be
   * useful to call from vanilla JavaScript because it returns an instance of Class, which can't be
   * converted to a standard JavaScript type. (Contrast to something like String or boolean.) Since
   * we're not calling it from JavaScript, we suppress the warning.
   */
  @JsMethod
  @SuppressWarnings("unusable-by-js")

    * This is comparable to using the model's `.model_dump()` method again, but it makes sure (and converts) the values to data types that can be converted to JSON, for example, `datetime` to `str`.
* Save the data to your DB.
* Return the updated model.

{* ../../docs_src/body_updates/tutorial002_py310.py hl[28:35] *}

/// tip

   * Ensures the truth of an expression involving one or more parameters to the calling method.
   *
   * @param expression a boolean expression
   * @param errorMessage the exception message to use if the check fails; will be converted to a
   *     string using {@link String#valueOf(Object)}
   * @throws IllegalArgumentException if {@code expression} is false
   */
  public static void checkArgument(boolean expression, @Nullable Object errorMessage) {

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

Vous savez maintenant qu'il faut corriger, convertir `age` en chaîne avec `str(age)` :

{* ../../docs_src/python_types/tutorial004_py310.py hl[2] *}

## Déclarer des types { #declaring-types }

     *             If the number of actual and formal parameters differ, if unwrapping of primitive arguments fails,
     *             or if after unwrapping, the parameter values cannot be converted to the corresponding formal parameter types,
     *             or if the constructor is related to an enum type
     * @see Constructor#newInstance(Object[])
     */

        return value;
    }

    /**
     * Convert the value.
     * @param scriptType The script type.
     * @param template The template.
     * @param paramMap The parameters.
     * @return The converted value.
     */
    protected Object convertValue(final String scriptType, final String template, final Map<String, Object> paramMap) {
        if (StringUtil.isEmpty(template)) {
            return StringUtil.EMPTY;

        "price": 42.0,
        "tax": 3.2
    },
    "user": {
        "username": "dave",
        "full_name": "Dave Grohl"
    },
    "importance": 5
}
```

Mais uma vez, ele converterá os tipos de dados, validar, documentar, etc.

## Múltiplos parâmetros de corpo e consulta { #multiple-body-params-and-query }

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[28:31] hl[29] *}

### Sans type de retour { #no-return-type }

Vous pouvez aussi omettre le type de retour. FastAPI utilisera le [`jsonable_encoder`](./encoder.md) pour convertir les données et les envoyer.

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[34:37] hl[35] *}

## `ServerSentEvent` { #serversentevent }

    }

    @Test
    public void test_render_escapedCharacters() {
        String markdown = "\\*not italic\\*";
        String result = markdownRenderer.render(markdown);
        // Escaped asterisks should not be converted to italics
        assertFalse(result.contains(""));
    }

    @Test
    public void test_render_strikethrough() {
        // Note: This depends on whether the extension is enabled