return errFileAccessDenied
		}
		return osErrToFileErr(err)
	}

	return nil
}

// Reliably retries os.MkdirAll if for some reason os.MkdirAll returns
// syscall.ENOENT (parent does not exist).
func reliableMkdirAll(dirPath string, mode os.FileMode, baseDir string) (err error) {
	i := 0
	for {
		// Creates all the parent directories, with mode 0777 mkdir honors system umask.

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

/// tip | Tipp

Sie können den Wert `"lenet"` außerdem mittels `ModelName.lenet.value` abrufen.

///

#### *Enumeration-Member* zurückgeben { #return-enumeration-members }

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

/// tip | Подсказка

Значение `"lenet"` также можно получить с помощью `ModelName.lenet.value`.

///

#### Возврат *элементов перечисления* { #return-enumeration-members }

Из *операции пути* можно вернуть *элементы перечисления*, даже вложенные в тело JSON (например в `dict`).

		v3, err := arg3.evalNode(r, tableAlias)
		if err != nil {
			return nil, err
		}
		inferTypeForArithOp(v3)
		lenInt, ok := v3.ToInt()
		if !ok {
			err := fmt.Errorf("Incorrect type for length argument in %s", sqlFnSubstring)
			return nil, errIncorrectSQLFunctionArgumentType(err)
		}
		length = int(lenInt)
		if length < 0 {
			err := fmt.Errorf("Negative length argument in %s", sqlFnSubstring)

#### 获取*枚举值*

使用 `model_name.value` 或 `your_enum_member.value` 获取实际的值（本例中为**字符串**）：

{* ../../docs_src/path_params/tutorial005.py hl[20] *}

/// tip | 提示

使用 `ModelName.lenet.value` 也能获取值 `"lenet"`。

///

#### 返回*枚举元素*

即使嵌套在 JSON 请求体里（例如， `dict`），也可以从*路径操作*返回*枚举元素*。

返回给客户端之前，要把枚举元素转换为对应的值（本例中为字符串）：

{* ../../docs_src/path_params/tutorial005.py hl[18,21,23] *}

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

/// tip | Dica
Você também pode acessar o valor `"lenet"` com `ModelName.lenet.value`.
///

#### Retorne membros de enumeração { #return-enumeration-members }

Você pode retornar *membros de enum* da sua *operação de rota*, até mesmo aninhados em um corpo JSON (por exemplo, um `dict`).

    override fun initialValue(): DateFormat {
      // Date format specified by RFC 7231 section 7.1.1.1.
      return SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss 'GMT'", Locale.US).apply {
        isLenient = false
        timeZone = UTC
      }
    }
  }

/** If we fail to parse a date in a non-standard format, try each of these formats in sequence. */
private val BROWSER_COMPATIBLE_DATE_FORMAT_STRINGS =
  arrayOf(

#### *열거형 값* 가져오기

`model_name.value` 또는 일반적으로 `your_enum_member.value`를 이용하여 실제 값(위 예시의 경우 `str`)을 가져올 수 있습니다:

{* ../../docs_src/path_params/tutorial005.py hl[20] *}

/// tip | 팁

`ModelName.lenet.value`로도 값 `"lenet"`에 접근할 수 있습니다.

///

#### *열거형 멤버* 반환

*경로 작동*에서 *열거형 멤버*를 반환할 수 있습니다. 이는 중첩 JSON 본문(예: `dict`)내의 값으로도 가능합니다.

클라이언트에 반환하기 전에 해당 값(이 경우 문자열)으로 변환됩니다:

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

/// tip

You could also access the value `"lenet"` with `ModelName.lenet.value`.

///

#### Return *enumeration members* { #return-enumeration-members }

You can return *enum members* from your *path operation*, even nested in a JSON body (e.g. a `dict`).

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

/// tip | Consejo

También podrías acceder al valor `"lenet"` con `ModelName.lenet.value`.

///

#### Devolver *miembros* de enumeración { #return-enumeration-members }