### 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()

          try {
            shutDown();
          } catch (Exception ignored) {
            restoreInterruptIfIsInterruptedException(ignored);
            logger
                .get()
                .log(
                    Level.WARNING,
                    "Error while attempting to shut down the service after failure.",
                    ignored);
          }
          notifyFailed(t);

> Requestsは今までで最もダウンロードされたPythonパッケージである

使い方はとても簡単です。例えば、`GET`リクエストを実行するには、このように書けば良いです:

```Python
response = requests.get("http://example.com/some/url")
```

対応するFastAPIのパスオペレーションはこのようになります:

```Python hl_lines="1"
@app.get("/some/url")
def read_url():
    return {"message": "Hello World"}
```

 `requests.get(...)` と`@app.get(...)` には類似点が見受けられます。

/// check | **FastAPI**へ与えたインスピレーション

Windows version of the kubelet.exe calls `GetPhysicallyInstalledSystemMemory` to get the physical memory installed on Windows machines and reports it as part of node metrics to heapster. This API call fails for VMware and VirtualBox virtualization environments. This issue is not present in bare metal Windows deployments, in Hyper-V, or on some of the popular public cloud providers.

*   If you run `kubectl get po` while the API server in unreachable, a misleading error is returned: `the...

                if (LogStream.level >= 6) {
                    Hexdump.hexdump(log, BUF, 4, n);
                }
            }
            /* For some reason this can sometimes get broken up into another
             * "NBSS Continuation Message" frame according to WireShark
             */
            out.write(BUF, 0, 4 + n);
        }
    }

    /**

When building web APIs with FastAPI, if there's an error in our code, FastAPI will normally contain it to the single request that triggered the error. 🛡

The client will get a **500 Internal Server Error** for that request, but the application will continue working for the next requests instead of just crashing completely.

### Bigger Errors - Crashes { #bigger-errors-crashes }