def METHOD_NAME(output_dir):
    """Unzip downloaded files (only compressed files)."""
    log.info("Unzipping data...")
    files = [os.path.join(output_dir, f) for f in os.listdir(output_dir)]
    for f in files:
        log.info(f)
        if f.endswith(".zip"):
            _unzip_file(f)