```Python hl_lines="2"
@app.get('/')
async def read_results():
    results = await some_library()
    return results
```

/// note

你只能在被 `async def` 创建的函数内使用 `await`

///

---

如果你正在使用一个第三方库和某些组件（比如：数据库、API、文件系统...）进行通信，第三方库又不支持使用 `await` （目前大多数数据库三方库都是这样），这种情况你可以像平常那样使用 `def` 声明一个路径操作函数，就像这样：

```Python hl_lines="2"
@app.get('/')
def results():
    results = some_library()

Você pode compará-lo com o *membro de enumeração* no seu enum `ModelName` criado:

{* ../../docs_src/path_params/tutorial005_py39.py hl[17] *}

#### Obtenha o valor da enumeração { #get-the-enumeration-value }

Você pode obter o valor real (um `str` neste caso) usando `model_name.value`, ou, em geral, `your_enum_member.value`:

{* ../../docs_src/path_params/tutorial005_py39.py hl[20] *}

		return errors.New("log buffer full")
	}
	return nil
}

// SendFromStore - reads the log from store and sends it to kafka.
func (h *Target) SendFromStore(key store.Key) (err error) {
	auditEntry, err := h.store.Get(key)
	if err != nil {
		if os.IsNotExist(err) {
			return nil
		}
		return err
	}
	atomic.AddInt64(&h.totalMessages, 1)
	err = h.send(auditEntry)
	if err != nil {

	// forcing cmd.Run to use another pipe and goroutine to pass
	// along stderr from adb.
	cmd.Stderr = struct{ io.Writer }{os.Stderr}
	err := cmd.Run()

	// Before we process err, flush any further output and get the exit code.
	exitCode, err2 := filter.Finish()

	if err != nil {
		return 0, fmt.Errorf("adb exec-out %s: %v", args, err)
	}
	return exitCode, err2
}

func adb(args ...string) error {

### 创建依赖项

首先，要关注的是依赖项。

依赖项就是一个函数，且可以使用与*路径操作函数*相同的参数：

{* ../../docs_src/dependencies/tutorial001.py hl[8:11] *}

大功告成。

只用了**2 行**代码。

依赖项函数的形式和结构与*路径操作函数*一样。

因此，可以把依赖项当作没有「装饰器」（即，没有 `@app.get("/some-path")` ）的路径操作函数。

依赖项可以返回各种内容。

本例中的依赖项预期接收如下参数：

* 类型为 `str` 的可选查询参数 `q`
* 类型为 `int` 的可选查询参数 `skip`，默认值是 `0`
* 类型为 `int` 的可选查询参数 `limit`，默认值是 `100`

然后，依赖项函数返回包含这些值的 `dict`。

* несовместимое изменение
* баг
* кнопка
* вызываемый объект
* код
* коммит
* менеджер контекста
* корутина
* сессия базы данных
* диск
* домен
* движок
* фиктивный X
* метод HTTP GET
* элемент
* библиотека
* lifespan
* блокировка
* middleware (Промежуточный слой)
* мобильное приложение
* модуль
* монтирование
* сеть
* origin (источник)
* переопределение

	files, _ := filepath.Glob(filepath.Join(diskPath, ".writable-check-*.tmp"))
	for _, file := range files {
		go removeAll(file)
	}

	// Remove the entire folder in case there are leftovers that didn't get cleaned up before restart.
	go removeAll(pathJoin(diskPath, minioMetaTmpBucket+"-old"))

	// Renames and schedules for purging all bucket metacache.
	go renameAllBucketMetacache(diskPath)
}

func (target *KafkaTarget) SendFromStore(key store.Key) (err error) {
	if err = target.init(); err != nil {
		return err
	}
	switch {
	case key.ItemCount == 1:
		var event event.Event
		event, err = target.store.Get(key)
		if err != nil {
			// The last event key in a successful batch will be sent in the channel atmost once by the replayEvents()
			// Such events will not exist and wouldve been already been sent successfully.

	}

	unlockReturned := make(chan struct{}, 1)
	go func() {
		ctx, cancel := context.WithTimeout(t.Context(), 500*time.Millisecond)
		defer cancel()
		dm.Unlock(ctx)
		// Unlock is not blocking. Try to get a new lock.
		dm.GetLock(ctx, nil, id, source, Options{Timeout: 5 * time.Minute})
		unlockReturned <- struct{}{}
	}()

	timer := time.NewTimer(2 * testDrwMutexUnlockCallTimeout)
	defer timer.Stop()

	if sys.LDAPConfig.Enabled() {
		sys.SetUsersSysType(LDAPUsersSysType)
	}

	if etcdClient == nil {
		var (
			group  *singleflight.Group
			policy *singleflight.Group
		)
		if env.Get("_MINIO_IAM_SINGLE_FLIGHT", config.EnableOn) == config.EnableOn {
			group = &singleflight.Group{}
			policy = &singleflight.Group{}
		}
		sys.store = &IAMStoreSys{