You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: packaging.go
    path of file: ./repos/trivy/pkg/fanal/analyzer/language/python/packaging
    
    the code of the file until where you have to start completion: package packaging

import (
	"archive/zip"
	"bytes"
	"context"
	"errors"
	"io"
	"io/fs"
	"os"
	"path"
	"path/filepath"
	"strings"

	"github.com/samber/lo"
	"golang.org/x/xerrors"

	"github.com/aquasecurity/trivy/pkg/dependency/parser/python/packaging"
	godeptypes "github.com/aquasecurity/trivy/pkg/dependency/parser/types"
	"github.com/aquasecurity/trivy/pkg/fanal/analyzer"
	"github.com/aquasecurity/trivy/pkg/fanal/analyzer/language"
	"github.com/aquasecurity/trivy/pkg/fanal/types"
	"github.com/aquasecurity/trivy/pkg/licensing"
	"github.com/aquasecurity/trivy/pkg/log"
	"github.com/aquasecurity/trivy/pkg/utils/fsutils"
	xio "github.com/aquasecurity/trivy/pkg/x/io"
)

func init() {
	analyzer.Regis
    
func (a packagingAnalyzer) fillAdditionalData(fsys fs.FS, app *types.Application) error {
	for i, lib := range app.Libraries {
		var licenses []string
		for _, lic := range lib.Licenses {
			// Parser adds `file://` prefix to filepath from `License-File` field
			// We need to read this file to find licenses
			// Otherwise, this is the name of the license
			if !strings.HasPrefix(lic, "file://") {
				licenses = append(licenses, lic)
				continue
			}
			licenseFilePath := path.Base(strings.TrimPrefix(lic, "file://"))

			findings, err := classifyLicense(app.FilePath, licenseFilePath, a.licenseClassifierConfidenceLevel, fsys)
			if err != nil {
				return err
			} else if len(findings) == 0 {
				continue
			}

			// License found
			foundLicenses := lo.Map(findings, func(finding types.LicenseFinding, _ int) string {
				return finding.Name
			})
			licenses = append(licenses, foundLicenses...)
		}
		app.Libraries[i].Licenses = licenses
	}

	return nil
}