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

## Declarando Tipos

Você acabou de ver o local principal para declarar type hints. Como parâmetros de função.

Este também é o principal local em que você os usaria com o **FastAPI**.

### Tipos simples

Você pode declarar todos os tipos padrão de Python, não apenas `str`.

Você pode usar, por exemplo:

 * either {@link Character} or {@link Arrays}.
 *
 * <p>All the operations in this class treat {@code char} values strictly numerically; they are
 * neither Unicode-aware nor locale-dependent.
 *
 * <p>See the Guava User Guide article on <a
 * href="https://github.com/google/guava/wiki/PrimitivesExplained">primitive utilities</a>.
 *
 * @author Kevin Bourrillion
 * @since 1.0
 */

    @SuppressWarnings("deprecation")
    static class MetadataRepository extends DefaultArtifactRepository {

        private File metadataFile;

        MetadataRepository(File metadataFile) {
            super("local", "", null);
            this.metadataFile = metadataFile;
        }

        @Override
        public String getBasedir() {
            return metadataFile.getParent();
        }

        @Override

          <!-- We add the link ourselves so that we can choose Java 21 over the version that -source suggests. -->
          <detectJavaApiLink>false</detectJavaApiLink>
          <offlineLinks>

     * Resolved sources are used for artifacts that have been resolved by Maven
     * from repositories (using groupId:artifactId:version coordinates) and
     * downloaded to the local repository. These sources do not support resolving
     * other sources.
     *
     * @param path the path to the POM file or project directory

   */
  public val target: String,
  /** A string like `HTTP/1.1` or `HTTP/2`. */
  public val version: String,
  /** The request URL built using the request line, headers, and local host name. */
  public val url: HttpUrl,
  /** All headers. */
  public val headers: Headers,
  /** The body of this request, or null if it has none. This may be truncated. */
  public val body: ByteString?,

    // racy single-check idiom, this is safe because Optional is immutable.
    Optional<Charset> local = parsedCharset;
    if (local == null) {
      String value = null;
      local = Optional.absent();
      for (String currentValue : parameters.get(CHARSET_ATTRIBUTE)) {
        if (value == null) {
          value = currentValue;
          local = Optional.of(Charset.forName(value));
        } else if (!value.equals(currentValue)) {

            // Test connection properties
            // Note: Local address may be null for TCP fallback provider
            InetSocketAddress localAddr = connection.getLocalAddress();
            if (localAddr != null) {
                System.out.println("Local address: " + localAddr);
            }

            // Test that connection was created successfully

<span style="color: green;">INFO</span>:     Application startup complete.
```

</div>

**Khuyến khích** bạn viết hoặc sao chép code, sửa và chạy nó ở local.

Sử dụng nó trong trình soạn thảo của bạn thực sự cho bạn thấy những lợi ích của FastAPI, thấy được cách bạn viết code ít hơn, tất cả đều được type check, autocompletion,...

---

## Cài đặt FastAPI

    * "dns" {
    *   "servers": ["10.0.0.10"],
    *   "searches": ["default.svc.cluster.local","svc.cluster.local","cluster.local"],
    *   "options": []
    * }