Script to rewrite the MP3 metadata in Ken Burns' Jazz album to be based on the length of the whole album

rewrite_ken_burns_jazz_mp3_metadata.py

# The Ken Burns Jazz album MP3s from Amazon have separate track and disc
# number metadata, but many MP3 players don't look at the disc number,
# which makes it hard to play the album's tracks in order.
#
# This script goes through all the MP3's of the album and removes the
# disc number and rewrites the track number to be based on all the
# tracks in the album, rather than all the tracks on a particular disc.
#
# This script could theoretically be used on any other multi-disc MP3
# album, but I've only tried it on the Ken Burns Jazz MP3 album in
# particular.
#
# Note that this code was informed by the following:
#
# https://methodmatters.github.io/editing-id3-tags-mp3-meta-data-in-python/

from pathlib import Path
from mutagen.mp3 import MP3  
from mutagen.easyid3 import EasyID3  

import glob

ALBUM_MP3_GLOB = Path("album") / "*.mp3"

mp3_files = glob.glob(str(ALBUM_MP3_GLOB))

tracks = []

for mp3_file in mp3_files:
    p = Path(mp3_file)
    mp3 = MP3(mp3_file, ID3=EasyID3)
    if 'discnumber' not in mp3:
        raise Exception(
            'No "discnumber" in MP3 metadata! Has this script '
            'already been run?'
        )
    disc = int(mp3['discnumber'][0].split('/')[0])
    track = int(mp3['tracknumber'][0].split('/')[0])
    disctrack = (disc * 100) + track
    tracks.append((disctrack, mp3))

tracks.sort(key=lambda x: x[0])

total_tracks = len(tracks)
tracknum = 0

print("Rewriting tracks to be based on length of whole album.")

for _, mp3 in tracks:
    tracknum += 1
    newtrack = f'{tracknum}/{total_tracks}'
    del mp3['discnumber']
    mp3['tracknumber'] = newtrack
    print(newtrack, mp3['title'][0])
    mp3.save()

print("Done!")