چون ویرایشگر نوع متغیرها رو می‌دونه، فقط تکمیل خودکار نمی‌گیری، بلکه چک خطاها هم داری:

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

حالا می‌دونی که باید درستش کنی، `age` رو با `str(age)` به یه رشته تبدیل کنی:

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

## تعریف نوع‌ها

تازه اصلی‌ترین جا برای تعریف نوع‌نماها رو دیدی. به‌عنوان پارامترهای تابع.

     *
     * @return this ExecJob instance for method chaining
     */
    public ExecJob gcLogging() {
        final StringBuilder buf = new StringBuilder(100);
        buf.append("-Xlog:gc*,gc+age=trace,safepoint:file=");
        if (logFilePath != null) {
            buf.append(logFilePath);
        } else {
            buf.append(ComponentUtil.getSystemHelper().getLogFilePath());
        }

  private fun trailersAndCache(protocol: Protocol) {
    enableProtocol(protocol)

    server.enqueue(
      MockResponse
        .Builder()
        .addHeader("h1", "v1")
        .addHeader("Cache-Control: max-age=30")
        .body(protocol, "Hello")
        .trailers(headersOf("t1", "v2"))
        .build(),
    )

    val call1 = client.newCall(Request(server.url("/")))
    call1.execute().use { response ->

    assertEqualCharNodes(traverser.breadthFirst(charactersOf("h")), "hdegabcf");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("gd")), "gdfabc");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("age")), "agef");
  }

  @Test
  public void forTree_breadthFirst_cyclicGraphContainingTree() throws Exception {
    Traverser<Character> traverser = Traverser.forTree(CYCLIC_GRAPH_CONTAINING_TREE);

    assertEqualCharNodes(traverser.breadthFirst(charactersOf("h")), "hdegabcf");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("gd")), "gdfabc");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("age")), "agef");
  }

  @Test
  public void forTree_breadthFirst_cyclicGraphContainingTree() throws Exception {
    Traverser<Character> traverser = Traverser.forTree(CYCLIC_GRAPH_CONTAINING_TREE);

In the interest of fostering an open and welcoming environment, we as
contributors and maintainers pledge to make participation in our project and our
community a harassment-free experience for everyone, regardless of age, body
size, disability, ethnicity, gender identity and expression, level of
experience, nationality, personal appearance, race, religion, or sexual identity
and orientation.

## Our Standards

     */
    public boolean isExpired() {
        if (authenticationTTL <= 0) {
            return false; // No expiration
        }
        long age = System.currentTimeMillis() - authenticationTimestamp;
        return age > authenticationTTL;
    }

    /**
     * Set the authentication time-to-live in milliseconds
     *

     */
    public int getKeyVersion(String sessionId) {
        return keyVersions.getOrDefault(sessionId, 0);
    }

    /**
     * Get key age in milliseconds
     *
     * @param sessionId the session ID
     * @return age in milliseconds, or -1 if unknown
     */
    public long getKeyAge(String sessionId) {
        Long creationTime = keyCreationTimes.get(sessionId);

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

Agora você sabe que precisa corrigí-lo, converta `age` em uma string com `str(age)`:

{* ../../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.

この関数を見てください。すでに型ヒントを持っています:

{* ../../docs_src/python_types/tutorial003.py hl[1] *}


エディタは変数の型を知っているので、補完だけでなく、エラーチェックをすることもできます。

<img src="https://fastapi.tiangolo.com/img/python-types/image04.png">

これで`age`を`str(age)`で文字列に変換して修正する必要があることがわかります:

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


## 型の宣言

関数のパラメータとして、型ヒントを宣言している主な場所を確認しました。

これは **FastAPI** で使用する主な場所でもあります。

### 単純な型