merge all mp4 video files into one file python

1from moviepy.editor import *
2import os
3from natsort import natsorted
4
5L =[]
6
7for root, dirs, files in os.walk("/path/to/the/files"):
8
9    #files.sort()
10    files = natsorted(files)
11    for file in files:
12        if os.path.splitext(file)[1] == '.mp4':
13            filePath = os.path.join(root, file)
14            video = VideoFileClip(filePath)
15            L.append(video)
16
17final_clip = concatenate_videoclips(L)
18final_clip.to_videofile("output.mp4", fps=24, remove_temp=False)