video_dirs = os.listdir (subject_root) # List video_dirs.sort (key = lambda x: int (x [5:])) # 5 indicates the starting position of sorting keywords, set by yourself
print:
['video1', 'video2', 'video3', 'video4', 'video5', 'video6', 'video7', 'video8', 'video9', 'video10', 'video11', 'video12']
