bandcamp_renamer.py

#!/usr/bin/env python3

import os

#Bandcamp filenames look like "<ARTIST> - <ALBUM> - ## TRACKNAME.flac"
old_names = [fn for fn in os.listdir('.') if os.path.splitext(fn)[1] == '.flac']

new_names = []
for name in old_names:
    new_name = name.split(' - ', 2)[2]
    int(new_name[:2])  # Will throw an error if this fails!
    new_name = new_name[:2] + ' -' + new_name[2:]
    new_names.append(new_name)
    
for old_name, new_name in zip(old_names, new_names):
    os.rename(old_name, new_name)