///

## 安装软件包 { #install-packages }

在激活虚拟环境后，你可以在其中安装软件包。

/// tip | 提示

当你需要安装或升级软件包时，执行本操作**一次**；

如果你需要再升级版本或添加新软件包，你可以**再次执行此操作**。

///

### 直接安装包 { #install-packages-directly }

如果你急于安装，不想使用文件来声明工程的软件包依赖，你可以直接安装它们。

/// tip | 提示

将程序所需的软件包及其版本放在文件中（例如 `requirements.txt` 或 `pyproject.toml`）是个好（并且非常好）的主意。

///

//// tab | `pip`

<div class="termy">

 * AbstractMapBasedMultimap} calls {@link #createCollection()} to create the collection of values
 * for that key. The subclass should not call {@link #createCollection()} directly, and a new
 * instance should be created every time the method is called.
 *
 * <p>For example, the subclass could pass a {@link java.util.TreeMap} during construction, and

Se precisar atualizar uma versão ou adicionar um novo pacote, você **fará isso novamente**.

///

### Instalar pacotes diretamente { #install-packages-directly }

Se estiver com pressa e não quiser usar um arquivo para declarar os requisitos de pacote do seu projeto, você pode instalá-los diretamente.

/// tip | Dica

    h += h << 3;
    h ^= h >>> 6;
    h += (h << 2) + (h << 14);
    return h ^ (h >>> 16);
  }

  /**
   * This method is a convenience for testing. Code should call {@link Segment#copyEntry} directly.
   */
  // Guarded By Segment.this
  @VisibleForTesting
  E copyEntry(E original, E newNext) {
    int hash = original.getHash();
    return segmentFor(hash).copyEntry(original, newNext);
  }

		}
	}

	// We must not use the http.Header().Set method here because some (broken)
	// clients expect the ETag header key to be literally "ETag" - not "Etag" (case-sensitive).
	// Therefore, we have to set the ETag directly as map entry.
	w.Header()[xhttp.ETag] = []string{"\"" + etag + "\""}
	hash.TransferChecksumHeader(w, r)

	writeSuccessResponseHeadersOnly(w)
}

// CompleteMultipartUploadHandler - Complete multipart upload.

		{Association: "Profiles", Type: clause.OpUpdate},
	}

	// In practice, each Association would be processed individually
	// since []clause.Association doesn't implement AssociationAssigner directly
	for i, assoc := range associations {
		assigns := assoc.AssociationAssignments()
		if len(assigns) != 1 {
			t.Errorf("Association %d should return one assignment, got %v", i, len(assigns))
		}

    ```

### Post Streaming ([.kt][PostStreamingKotlin], [.java][PostStreamingJava])

Here we `POST` a request body as a stream. The content of this request body is being generated as it's being written. This example streams directly into the [Okio](https://github.com/square/okio) buffered sink. Your programs may prefer an `OutputStream`, which you can get from `BufferedSink.outputStream()`.

=== ":material-language-kotlin: Kotlin"
    ```kotlin

            String sourceHint,
            InputLocationTracker tracker,
            ModelBuildingRequest request) {
        if (string == null) {
            // NOTE: The check for missing plugin versions is handled directly by the model builder
            return true;
        }

        Severity errOn30 = getSeverity(request, ModelBuildingRequest.VALIDATION_LEVEL_MAVEN_3_0);

then <i>w</i> is synchronized before <i>r</i>.
Informally, the synchronized before relation is a subset of the implied total order
mentioned in the previous paragraph,
limited to the information that <i>W</i> directly observes.
</p>

<p>
The <i>happens before</i> relation is defined as the transitive closure of the
union of the sequenced before and synchronized before relations.
</p>

<p>
<b>Requirement 3</b>:

import org.codelibs.fess.helper.FileTypeHelper;
import org.codelibs.fess.helper.LabelTypeHelper;
import org.codelibs.fess.helper.PathMappingHelper;
import org.codelibs.fess.helper.SystemHelper;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.opensearch.config.exentity.CrawlingConfig;
import org.codelibs.fess.opensearch.config.exentity.CrawlingConfig.ConfigName;