import osclass BatchRename(): def __init__(self):  self.path = 'C:/Users/zxl/Desktop/tr' def rename(self):  filelist = os.listdir(self.path)  total_num = len(filelist)  i = 101  for item in filelist:   if item.endswith('.jpg'):    src = os.path.join(os.path.abspath(self.path), item)    dst = os.path.join(os.path.abspath(self.path), str(i) + '.jpg')    try:     os.rename(src, dst)     print 'converting %s to %s ...' % (src, dst)     i = i + 1    except:     continue  print 'total %d to rename & converted %d jpgs' % (total_num, i)if __name__ == '__main__': demo = BatchRename() demo.rename()