Dies wird der Hauptinteraktionspunkt für die Erstellung all Ihrer APIs sein.

### Schritt 3: Erstellen einer *Pfadoperation* { #step-3-create-a-path-operation }

#### Pfad { #path }

„Pfad“ bezieht sich hier auf den letzten Teil der URL, beginnend mit dem ersten `/`.

In einer URL wie:

```
https://example.com/items/foo
```

... wäre der Pfad folglich:

		return 0, err
	}
	var deviceCwd string
	if isStd {
		// Note that we use path.Join here instead of filepath.Join:
		// The device paths should be slash-separated even if the go_android_exec
		// wrapper itself is compiled for Windows.
		deviceCwd = path.Join(deviceGoroot, "src", importPath)
	} else {
		deviceCwd = path.Join(deviceGopath, "src", importPath)
		if modDir != "" {

Ici, la variable `app` sera une « instance » de la classe `FastAPI`.

Ce sera le point principal d’interaction pour créer toute votre API.

### Étape 3 : créer un « chemin d’accès » { #step-3-create-a-path-operation }

#### Chemin { #path }

« Chemin » fait ici référence à la dernière partie de l’URL à partir du premier `/`.

Donc, dans une URL telle que :

```
https://example.com/items/foo
```

{* ../../docs_src/first_steps/tutorial001_py310.py hl[3] *}

这里的变量 `app` 会是 `FastAPI` 类的一个「实例」。

这个实例将是创建你所有 API 的主要交互对象。

### 步骤 3：创建一个*路径操作* { #step-3-create-a-path-operation }

#### 路径 { #path }

这里的「路径」指的是 URL 中从第一个 `/` 起的后半部分。

所以，在一个这样的 URL 中：

```
https://example.com/items/foo
```

...路径会是：

```
/items/foo
```

/// info

    assert response.status_code == 200, response.text
    assert response.json() == snapshot(
        {
            "openapi": "3.1.0",
            "info": {"title": "FastAPI", "version": "0.1.0"},
            "paths": {
                "/no_response_model-no_annotation-return_model": {
                    "get": {
                        "summary": "No Response Model No Annotation Return Model",

	return err
}

// Check if the incoming path has bad path components,
// such as ".." and "."
func hasBadPathComponent(path string) bool {
	n := len(path)
	if n > 32<<10 {
		// At 32K we are beyond reasonable.
		return true
	}
	i := 0
	// Skip leading slashes (for sake of Windows \ is included as well)
	for i < n && (path[i] == SlashSeparatorChar || path[i] == '\\') {
		i++
	}

	for i < n {

        flag.

        ```bash
        export flags="--config=linux --config=cuda -k"
        ```

    *   For TensorFlow versions prior v.2.18.0: Add CUDA paths to
        LD_LIBRARY_PATH and add the `cuda` option flag.

        ```bash
        export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:/usr/local/cuda/lib64:/usr/local/cuda/extras/CUPTI/lib64:$LD_LIBRARY_PATH"

			}

			subrouter := router.PathPrefix(path.Join(storageRESTPrefix, endpoint.Path)).Subrouter()

			subrouter.Methods(http.MethodPost).Path(storageRESTVersionPrefix + storageRESTMethodHealth).HandlerFunc(h(server.HealthHandler))
			subrouter.Methods(http.MethodPost).Path(storageRESTVersionPrefix + storageRESTMethodAppendFile).HandlerFunc(h(server.AppendFileHandler))

Ya creaste una API que:

* Recibe requests HTTP en los _paths_ `/` y `/items/{item_id}`.
* Ambos _paths_ toman _operaciones_ `GET` (también conocidas como métodos HTTP).
* El _path_ `/items/{item_id}` tiene un _parámetro de path_ `item_id` que debe ser un `int`.
* El _path_ `/items/{item_id}` tiene un _parámetro de query_ `q` opcional que es un `str`.

### Documentación interactiva de la API { #interactive-api-docs }

* Recebe requisições HTTP nos _paths_ `/` e `/items/{item_id}`.
* Ambos _paths_ fazem operações `GET` (também conhecido como _métodos_ HTTP).
* O _path_ `/items/{item_id}` tem um _parâmetro de path_ `item_id` que deve ser um `int`.
* O _path_ `/items/{item_id}` tem um _parâmetro query_ `q` `str` opcional.

### Documentação Interativa da API { #interactive-api-docs }