## 사전정의 값 { #predefined-values }

만약 *경로 매개변수*를 받는 *경로 처리*가 있지만, 가능한 유효한 *경로 매개변수* 값들을 미리 정의하고 싶다면 파이썬 표준 <abbr title="Enumeration - 열거형">`Enum`</abbr>을 사용할 수 있습니다.

### `Enum` 클래스 생성 { #create-an-enum-class }

`Enum`을 임포트하고 `str`과 `Enum`을 상속하는 서브 클래스를 만듭니다.

`str`을 상속함으로써 API 문서는 값이 `string` 형이어야 하는 것을 알게 되고 이는 문서에 제대로 표시됩니다.

가능한 값들에 해당하는 고정된 값의 클래스 어트리뷰트들을 만듭니다:

* 共享业务逻辑（同一段代码逻辑反复复用）
* 共享数据库连接
* 实施安全、认证、角色权限等要求
* 以及更多其他内容...

同时尽量减少代码重复。

## 第一步 { #first-steps }

先来看一个非常简单的例子。它现在简单到几乎没什么用。

但这样我们就可以专注于**依赖注入**系统是如何工作的。

### 创建依赖项，或“dependable” { #create-a-dependency-or-dependable }

首先关注依赖项。

它只是一个函数，且可以接收与*路径操作函数*相同的所有参数：

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[8:9] *}

大功告成。

**2 行**。

它的形式和结构与所有*路径操作函数*相同。

            + "If you do need to create a TypeToken of a type variable, "
            + "please use TypeToken.of() instead.",
        runtimeType);
  }

  /**
   * Constructs a new type token of {@code T} while resolving free type variables in the context of
   * {@code declaringClass}.
   *
   * <p>Clients create an empty anonymous subclass. Doing so embeds the type parameter in the

    lock01 = factory3.newReentrantLock(OtherOrder.FIRST);
    lock02 = factory3.newReentrantLock(OtherOrder.SECOND);
    lock03 = factory3.newReentrantLock(OtherOrder.THIRD);
  }

  // In the unittest, create each ordered factory with its own set of lock
  // graph nodes (as opposed to using the static per-Enum map) to avoid
  // conflicts across different test runs.
  private <E extends Enum<E>>

    lock01 = factory3.newReentrantLock(OtherOrder.FIRST);
    lock02 = factory3.newReentrantLock(OtherOrder.SECOND);
    lock03 = factory3.newReentrantLock(OtherOrder.THIRD);
  }

  // In the unittest, create each ordered factory with its own set of lock
  // graph nodes (as opposed to using the static per-Enum map) to avoid
  // conflicts across different test runs.
  private <E extends Enum<E>>

  public Range<K> span() {
    if (ranges.isEmpty()) {
      throw new NoSuchElementException();
    }
    Range<K> firstRange = ranges.get(0);
    Range<K> lastRange = ranges.get(ranges.size() - 1);
    return Range.create(firstRange.lowerBound, lastRange.upperBound);
  }

  /**
   * Guaranteed to throw an exception and leave the {@code RangeMap} unmodified.
   *
   * @throws UnsupportedOperationException always

        }
    }

    @Test
    @DisplayName("Test writeParametersWireFormat with encoding issue simulation")
    void testWriteParametersWireFormatEncodingIssue() throws Exception {
        // Create a modified NetShareEnum to test encoding exception path
        NetShareEnum testEnum = new NetShareEnum(realConfig) {
            @Override
            protected int writeParametersWireFormat(byte[] dst, int dstIndex) {

import jcifs.dcerpc.UnicodeString;
import jcifs.dcerpc.msrpc.LsaPolicyHandle;
import jcifs.dcerpc.msrpc.lsarpc;

@ExtendWith(MockitoExtension.class)
class SIDCacheImplTest {

    // Helper to create a SID from text without throwing in the test body
    private static SID sid(String textual) {
        try {
            return new SID(textual);
        } catch (SmbException e) {
            throw new RuntimeException(e);

   | However, this repository may have problems with heavy traffic at times, so people have mirrored
   | it to several places.
   |
   | That repository definition will have a unique id, so we can create a mirror reference for that
   | repository, to be used as an alternate download site. The mirror site will be the preferred
   | server for that repository.
   |-->
  <mirrors>
    <!-- mirror

{* ../../docs_src/dependencies/tutorial011_an_py310.py hl[9] *}

Neste caso, o **FastAPI** nunca tocará ou se importará com o `__init__`, nós vamos utilizar diretamente em nosso código.

## Crie uma instância { #create-an-instance }

Nós poderíamos criar uma instância desta classe com:

{* ../../docs_src/dependencies/tutorial011_an_py310.py hl[18] *}