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## Our Standards

看这个已经带有类型提示的函数：

{* ../../docs_src/python_types/tutorial003_py310.py hl[1] *}

因为编辑器知道变量的类型，你不仅能得到补全，还能获得错误检查：

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

现在你知道需要修复它，用 `str(age)` 把 `age` 转成字符串：

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

## 声明类型 { #declaring-types }

你刚刚看到的是声明类型提示的主要位置：函数参数。

这也是你在 **FastAPI** 中使用它们的主要场景。

### 简单类型 { #simple-types }

     */
    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);

  @Override public Response intercept(Interceptor.Chain chain) throws IOException {
    Response originalResponse = chain.proceed(chain.request());
    return originalResponse.newBuilder()
        .header("Cache-Control", "max-age=60")
        .build();
  }
};
```

}

// CreateView create view from Query in gorm.ViewOption.
// Query in gorm.ViewOption is a [subquery]
//
//	// CREATE VIEW `user_view` AS SELECT * FROM `users` WHERE age > 20
//	q := DB.Model(&User{}).Where("age > ?", 20)
//	DB.Debug().Migrator().CreateView("user_view", gorm.ViewOption{Query: q})
//
//	// CREATE OR REPLACE VIEW `users_view` AS SELECT * FROM `users` WITH CHECK OPTION
//	q := DB.Model(&User{})

     *
     * @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());
        }

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_py310.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="/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_py310.py hl[2] *}

## 型の宣言 { #declaring-types }

型ヒントを宣言する主な場所を見てきました。関数のパラメータです。

これは **FastAPI** で使用する主な場所でもあります。

  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 ->

	// Verify signature.
	if !compareSignatureV4(req.Form.Get(xhttp.AmzSignature), newSignature) {
		return ErrSignatureDoesNotMatch
	}

	r.Header.Set("x-amz-signature-age", strconv.FormatInt(UTCNow().Sub(pSignValues.Date).Milliseconds(), 10))

	return ErrNone
}

// doesSignatureMatch - Verify authorization header with calculated header in accordance with

      Header("accept-encoding", "gzip, deflate"),
      Header("accept-language", ""),
      Header("accept-ranges", ""),
      Header("accept", ""),
      Header("access-control-allow-origin", ""),
      Header("age", ""),
      Header("allow", ""),
      Header("authorization", ""),
      Header("cache-control", ""),
      Header("content-disposition", ""),
      Header("content-encoding", ""),
      Header("content-language", ""),