def _build_archive(self, dir_path):
        """
        Creates a zip archive from files in path.
        """
        zip_path = os.path.join(dir_path, "import.zip")
        archive = zipfile.ZipFile(zip_path, "w")

        for filename in CSV_FILES:
            filepath = os.path.join(dir_path, filename)

            if os.path.exists(filepath):
                archive.write(filepath, filename, zipfile.ZIP_DEFLATED)

        archive.close()

        with open(zip_path, "rb") as f:
            body = f.read()

        return body
Creates a zip archive from files in path.