python 给文件夹下的文件增加数字序列

import os
 
def getAllFiles(file_dir):
     L=[]
     for root, dirs, files in os.walk(file_dir):
         for file in files:
             if os.path.splitext(file)[1] == '.xlsx':
                 L.append(os.path.join(root, file))
     return L
 
 
files=sorted(getAllFiles("/Volumes/下载/超级飞侠/超级飞侠第二季/测试"))
print(files)

sequence=0;
for i, file in enumerate(files):
    filepath=os.path.dirname(file);
    filename=os.path.basename(file).split('.')[0]

    if len(filename)<=0:
    	continue
    sequence=sequence+1
    index="%03d" %(sequence)

    print("---"+filepath+"/"+filename)
    cmd="mv "+file+ " "+ filepath+"/"+index +"-"+ filename+".xlsx"

    print(cmd)
    os.system(cmd)