import ospath="C:/Users/kele/Desktop/testfloader"targetpath="C:/Users/kele/Desktop/targetfloader"def scan_files(directory,postfix=None):  files_list=[]  path=unicode(directory,'utf-8')  for root, sub_dirs, files in os.walk(path):    for special_file in files:      if postfix:        if special_file.endswith(postfix):          cutmove(root,special_file)      else:        cutmove(root,special_file)def cutmove(root,special_file):  if os.path.isfile(targetpath+"/"+special_file):    os.remove(targetpath+"/"+special_file)  os.rename(root+"/"+special_file,targetpath+"/"+special_file)def runmian():  if not os.path.isdir(targetpath):    os.mkdir(targetpath)  scan_files(path,".mobi")runmian()