查询当前文件夹及其子文件夹下mp4文件的个数

import os

Root = os.getcwd()  # 当前文件所在目录
print(Root)

Dest = 'dealed_dir'
n = 0
for (root, dirs, files) in os.walk(Root):
    print(files)
    print(len(files))
    for f in files:
        (shotname, extension) = os.path.splitext(f)
        if extension == '.mp4':
            n += 1

print(n)