Rename MP3 files based on ID3 tag

rename-based-on-id3-tag.py

#!/usr/bin/env python2

import taglib
import os
import os.path

filenames = []
for root, dirs, files in os.walk("."):
    def fullpath(x):
        return os.path.join(root, x)

    def mp3(x):
        return x.endswith(".mp3")

    filenames.extend(map(fullpath, filter(mp3, files)))

for filename in filenames:
    song = taglib.File(filename)

    def t(k):
        if k.upper() in song.tags:
            v = song.tags[k.upper()][0]
            if "NUMBER" in k.upper() and "/" in v:
                v = map(int, v.split("/"))
                v = "".join(map(lambda x: "%02d" % x, v))
            return v
        else:
            return None

    newname = u" - ".join(filter(lambda x: x is not None, map(t, ["artist", "album", "discnumber", "tracknumber", "title"])))
    os.rename(filename, newname + ".mp3")