def _add_data_files(self, data_files):
        """
        Add data files as found in build_py.data_files.
        """
        self.filelist.extend(
            os.path.join(src_dir, name)
            for _, src_dir, _, filenames in data_files
            for name in filenames
        )

        Add data files as found in build_py.data_files.
        
product/gradle-plugin/src/main/python/setuptools/command/sdist.py