* `/items/{item_id}` _yolu_ `item_id` adlı `int` qiyməti almalı olan _yol parametrinə_ sahibdir.
* `/items/{item_id}` _yolunun_ `q` adlı yol parametri var və bu parametr istəyə bağlı olsa da, `str` qiymətini almalıdır.

### İnteraktiv API Sənədləri

İndi <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a> ünvanına daxil olun.

在许多情况下，您的应用程序可能需要一些外部设置或配置，例如密钥、数据库凭据、电子邮件服务的凭据等等。

这些设置中的大多数是可变的（可以更改的），比如数据库的 URL。而且许多设置可能是敏感的，比如密钥。

因此，通常会将它们提供为由应用程序读取的环境变量。

## 环境变量

/// tip

如果您已经知道什么是"环境变量"以及如何使用它们，请随意跳到下面的下一节。

///

环境变量（也称为"env var"）是一种存在于 Python 代码之外、存在于操作系统中的变量，可以被您的 Python 代码（或其他程序）读取。

您可以在 shell 中创建和使用环境变量，而无需使用 Python：

//// tab | Linux、macOS、Windows Bash

<div class="termy">

```console
// 您可以创建一个名为 MY_NAME 的环境变量

    for (int i = 0; i < map.segments.length; i++) {
      assertEquals(segmentSize, map.segments[i].table.length());
    }
  }

  public void testSetMaximumSize() {
    // vary maximumSize wrt concurrencyLevel

    for (int maxSize = 1; maxSize < 100; maxSize++) {
      checkMaximumSize(1, 8, maxSize);
      checkMaximumSize(2, 8, maxSize);
      checkMaximumSize(4, 8, maxSize);

    for (int i = 0; i < map.segments.length; i++) {
      assertEquals(segmentSize, map.segments[i].table.length());
    }
  }

  public void testSetMaximumSize() {
    // vary maximumSize wrt concurrencyLevel

    for (int maxSize = 1; maxSize < 100; maxSize++) {
      checkMaximumSize(1, 8, maxSize);
      checkMaximumSize(2, 8, maxSize);
      checkMaximumSize(4, 8, maxSize);

						{PrimaryKey: "ID", PrimarySchema: "Country", ForeignKey: "CountryID", ForeignSchema: "Org"},
					},
				},
			},
		},
	})
}

func TestVariableRelation(t *testing.T) {
	var result struct {
		User
	}

	checkStructRelation(t, &result, Relation{
		Name: "Account", Type: schema.HasOne, Schema: "", FieldSchema: "Account",
		References: []Reference{

 *  Fix: Websockets no longer rebuffer socket streams.
 *  Fix: Websockets are now better at handling close frames.
 *  Fix: Content type matching is now case insensitive.
 *  Fix: `Vary` headers are not lost with `android.net.http.HttpResponseCache`.
 *  Fix: HTTP/2 wasn't enforcing stream timeouts when writing the underlying
    connection. Now it is.

pkg syscall (freebsd-386-cgo), type Timeval struct, Usec int32
pkg syscall (freebsd-386-cgo), type WaitStatus uint32
pkg syscall (freebsd-386-cgo), var Stderr int
pkg syscall (freebsd-386-cgo), var Stdin int
pkg syscall (freebsd-386-cgo), var Stdout int
pkg syscall (freebsd-amd64), const F_DUP2FD_CLOEXEC = 18
pkg syscall (freebsd-amd64), const F_DUP2FD_CLOEXEC ideal-int

- There is now support for collecting pod logs under `/var/log/pods/NAMESPACE_NAME_UID` to stackdriver with `k8s_pod` resource type. ([#74502](https://github.com/kubernetes/kubernetes/pull/74502), [@Random-Liu](https://github.com/Random-Liu))

    assertThat(parse(url, "a=b ; SameSite=Lax ;")!!.sameSite).isEqualTo("Lax")
    assertThat(parse(url, "a=\r\t \nb\n; \rSameSite=\n \tLax")!!.sameSite).isEqualTo("Lax")
  }

  @Test fun builderSameSiteTrimmed() {
    var cookieBuilder =
      Cookie.Builder()
        .name("a")
        .value("b")
        .domain("example.com")

    assertThrows<IllegalArgumentException> {
      cookieBuilder.sameSite(" a").build()
    }

   * without contention. Because assignment of entries to these partitions is not necessarily
   * uniform, the actual concurrency observed may vary. Ideally, you should choose a value to
   * accommodate as many threads as will ever concurrently modify the table. Using a significantly
   * higher value than you need can waste space and time, and a significantly lower value can lead