Tag the files from gmusic app cache

gmusic_to_mp3.py

#!/usr/bin/env python
# -*-coding:utf-8 -*
# mp3 files from gmusic app's cache don't have id3 tags assosciated with them.
# This assigns tags for them based on music.db found in the app dirs.
# Useful if you want to just copy mp3 from your phone and use them somewhere
# (instead of waiting to download them from the gmusic web (or desktop) app)
#
# Run it from the mp3 folder, and keep music.db in the same folder
#
# By <anupdhml@gmail.com>, October 2014

import glob, os
import sqlite3
from mutagen.easyid3 import EasyID3
from mutagen.id3 import ID3NoHeaderError
#from pprint import pprint

conn = sqlite3.connect('music.db')
c = conn.cursor()
#c.execute("SELECT name FROM sqlite_master WHERE type='table';")
#print(c.fetchall())

#pprint(EasyID3.valid_keys.keys())

for mp3 in glob.glob("./*.mp3"):
    print "Working on", mp3, '...'

    base = os.path.basename(mp3)
    id = os.path.splitext(base)[0]
    c.execute("SELECT Title, Album, Artist, AlbumArtist, Composer, Genre, Year, TrackCount, TrackNumber FROM MUSIC WHERE Id=" + id)
    mp3tags = c.fetchone() 
    #pprint(mp3tags)

    try:
        audio = EasyID3(mp3)
    except ID3NoHeaderError:
        print "Adding id3 tag headers"
        audio = EasyID3()

    audio["title"] = mp3tags[0]
    audio["album"] = mp3tags[1]
    audio["artist"] = mp3tags[2]
    audio["composer"] = mp3tags[4]
    audio["genre"] = mp3tags[5]
    audio["date"] = str(mp3tags[6])
    audio["tracknumber"] = str(mp3tags[8])
    audio.save(mp3)

conn.close()