Python写入数据到MP3文件中的方法

writeMp3Header[ SongName] = '测试歌曲名称' 
writeMp3Header[ SongPeople] = '不得闲' 
writeMp3Header[ ZhuanJi] = '专辑' 
writeMp3Header[ Year] = '2009' 
writeMp3Header[ Bak] = '备注测试' 
setMp3Header(r'E:\test.mp3')

writeMp3Header = {
   "SongName":"",
   "SongPeople":"",
   "ZhuanJi":"",
   "Year":"",
   "Bak":""
   }
 def setMp3Header(mp3file):
   mp3Id3V1 = {    
     "SongName":-125,
     "SongPeople":-95,
     "ZhuanJi":-65,
     "Year":-35,
     "Bak":-31
     }
   tags = ['SongName','SongPeople','ZhuanJi','Bak']
   f = open(mp3file,'r+')
   try:
     f.seek(-128,2)
     try:
       tempstr = f.read(3)
       if tempstr == 'TAG':
         for tag,startPos in mp3Id3V1.items():
           if writeMp3Header[tag] != '':
             f.seek(startPos,2)
             if tag in tags:
               if len(writeMp3Header[tag]) > 30: 
                 f.write(writeMp3Header[tag][:30])
               else:
                 f.write(writeMp3Header[tag])
             print startPos,tag,writeMp3Header[tag]
       else:
         print 'is not a mp3file'
     except IOError:
       print 'read error'
   finally:
     f.close()