**FastAPI** is helemaal gebaseerd op deze type hints, ze geven veel voordelen.

Maar zelfs als je **FastAPI** nooit gebruikt, heb je er baat bij om er iets over te leren.

/// note

Als je een Python expert bent en alles al weet over type hints, sla dan dit hoofdstuk over.

///

## Motivatie

Laten we beginnen met een eenvoudig voorbeeld:

{* ../../docs_src/python_types/tutorial001.py *}

   * timeouts (due to a problem with the transport). When a stream times out we don't know whether
   * the problem impacts just one stream or the entire connection.
   *
   * To differentiate the two cases we ping the server when a stream times out. If the overall
   * connection is fine the ping will receive a pong; otherwise it won't.
   *

   */
  public Optional<Long> sizeIfKnown() {
    return Optional.absent();
  }

  /**
   * Returns the size of this source in bytes, even if doing so requires opening and traversing an
   * entire stream. To avoid a potentially expensive operation, see {@link #sizeIfKnown}.
   *
   * <p>The default implementation calls {@link #sizeIfKnown} and returns the value if present. If

labels.incrementalCrawling=Comprobar fecha de última modificación
labels.errorCount=Número de errores
labels.errorLog=Registro de errores
labels.errorName=Nombre del error
labels.expiredTime=Fecha de caducidad
labels.expires=Caduca
labels.failureCountThreshold=Umbral de fallos
labels.fileConfigName=Nombre de configuración de rastreo de archivos
labels.fileName=Nombre de archivo
labels.handlerName=Nombre del manejador

labels.defaultLabelValue=기본 라벨
labels.designFileName=파일 이름
labels.incrementalCrawling=최종 갱신 일시 확인
labels.errorCount=오류 횟수
labels.errorLog=오류 로그
labels.errorName=오류 이름
labels.expiredTime=만료 시간
labels.expires=만료
labels.failureCountThreshold=장애 수
labels.fileConfigName=파일 크롤링 설정 이름
labels.fileName=파일 이름
labels.handlerName=핸들러 이름
labels.handlerParameter=파라미터
labels.handlerScript=스크립트
labels.popularWord=인기 검색어

There are many **alternatives** to managing virtual environments, package dependencies (requirements), projects.

Once you are ready and want to use a tool to **manage the entire project**, packages dependencies, virtual environments, etc. I would suggest you try <a href="https://github.com/astral-sh/uv" class="external-link" target="_blank">uv</a>.

`uv` can do a lot of things, it can:

        // cid
        final String configId = crawlingConfig.getConfigId();
        if (configId != null) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldConfigId(), configId);
        }
        //  expires
        if (documentExpires != null) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldExpires(), documentExpires);
        }
        // lang
        final String lang = systemHelper.normalizeHtmlLang(

labels.csvFileEncoding=CSV编码
labels.defaultLabelValue=默认标签
labels.designFileName=文件名
labels.incrementalCrawling=检查上次修改时间
labels.errorCount=错误数
labels.errorLog=错误日志
labels.errorName=错误名称
labels.expiredTime=有效期
labels.expires=过期
labels.failureCountThreshold=失败次数
labels.fileConfigName=文件爬网配置名称
labels.fileName=文件名
labels.handlerName=处理程序名称
labels.handlerParameter=参数
labels.handlerScript=脚本
labels.popularWord=热门词

        // Improved attribute caching with more granular cache validation
        long currentTime = System.currentTimeMillis();
        if (this.attrExpiration > currentTime) {
            log.trace("Using cached attributes (expires in {}ms)", this.attrExpiration - currentTime);
            return this.isExists;
        }

        // Fast path for already resolved existence with recent cache

            // Verify nonce structure
            assertEquals(16, nonce.length, "GCM secure nonce should be 16 bytes");

            // Check that secure nonces provide full diversity (entire nonce is random)
            String nonceHex = bytesToHex(nonce);
            nonceSet.add(nonceHex);
        }

        // Verify that secure nonces provide excellent diversity