python script to tag mp3 files by directory structure

change_id3.py

from mutagen.mp3 import MP3
from mutagen.id3 import TIT2, TPE1, TALB
import os
import sys

for artist in sys.argv[1:]:
    print 'artist=%s' % artist
    for root, directories, filenames in os.walk(artist):
        print 'Entering %s' % root
        album = os.path.basename(root)
        for filename in filenames:
            title, ext = os.path.splitext(filename)
            if ext.upper() == '.MP3':
                print 'Found %s' % title
                try:
                    audio = MP3(root + '/' + filename)
                    audio["TIT2"] = TIT2(encoding=3, text=title)
                    audio["TPE1"] = TPE1(encoding=3, text=artist)
                    audio["TALB"] = TALB(encoding=3, text=album)
                    audio.save()
                except:
                    print 'Failed to tag %s' % filename