python一括変更画像名(接尾辞変更可能)

import os
#        
path = r"C:\Users\great\Desktop\111\\"
#           ，     
fileList = os.listdir(path)

n = 0
for i in fileList:
    #       （    +   ）
    oldname = path + os.sep + fileList[n]  # os.sep       
    #       
    newname = path  + os.sep + ''+str(n + 0) + '.jpg'
    os.rename(oldname, newname)  #  os    rename       
    print(oldname, '======>', newname)
    n += 1