def format_bytes(bytes_size):
    """Convert bytes to human readable format"""
    if bytes_size < 1024:
        return f"{bytes_size} B"

    for unit in ['B', 'KB', 'MB', 'GB', 'TB']:
        if bytes_size < 1024.0:
            return f"{bytes_size:.1f} {unit}"
        bytes_size /= 1024.0

    return f"{bytes_size:.1f} PB"