wma批量转换为mp3

#!/usr/bin/env python
# -*- coding: UTF-8 -*-

import os
import sys
#取目录下的目录列表
storylist  =  os.listdir('.')
storylist.sort()
for storyfile in storylist:
    storyfile.replace(' ', '\ ')
    desfilenamenum = os.path.splitext(storyfile)[0][0:2]
    desnum = int(desfilenamenum) + 40
    desfilename = str(desnum)+ 'level3.mp3'
    cmdstr1 = 'mplayer ' + storyfile + ' -ao pcm:file=file.wav'
    cmdstr2 = 'lame  -h file.wav /media/789D-56E9/' + desfilename
    print cmdstr1
    os.system(cmdstr1)
    print cmdstr2
    os.system(cmdstr2)