def _initialize_filenames(self, chunk_id):
    data_file_path = os.path.join(self.output_dir, 'data_{}.gulp'.format(chunk_id))
    meta_file_path = os.path.join(self.output_dir, 'meta_{}.gmeta'.format(chunk_id))
    return (data_file_path, meta_file_path)
def _initialize_filenames(self, chunk_id):
    data_file_path = os.path.join(self.output_dir, 'data_{}.gulp'.format(chunk_id))
    meta_file_path = os.path.join(self.output_dir, 'meta_{}.gmeta'.format(chunk_id))
    return (data_file_path, meta_file_path)