#-*-code: UTF-8-*- 
 Import OS 

 def rename (): 
         i = 0 
         PATH = "E:/TMP/PIC/AA" 
         filelist = os.listdir (PATH)#All files (including folders) under the folder 
         For FILES in Filelist: #Prink through all files 
             I = i+1 
             Olddir = OS.Path.Join (PATH, FILES) #The original file path 
             if os.path.isdir (Olddir):#If it is a folder, skip 
                     continue 
             filename = OS.Path.Splitext (Files) [0] #file name 
             filetype = OS.Path.Splitext (FILES) [1] #file extension name 
             Newdir = OS.Path.join (PATH, Str (i)+Filetype) #New file path 
             Os.rename (Olddir, Newdir) # 
 rename ()