def safe_delete(csv_full_path):
    # 自动清理
    try:
        csv_full_path.unlink()
    except Exception as e:
        pass

def format_file_size(size_bytes: int) -> str:
    """格式化文件大小"""
    for unit in ['B', 'KB', 'MB', 'GB']:
        if size_bytes < 1024.0:
            return f"{size_bytes:.2f} {unit}"
        size_bytes /= 1024.0
    return f"{size_bytes:.2f} TB"