Easy way to sort a nested dict

[Gribouillis]

Buran's idea is very good. Here is a variation with some abstraction

#!/usr/bin/python3
from collections import OrderedDict
 
db = \
{
  "/data/Music/Daft Punk/Tron_ Legacy (Cd1)/1-17 Disc Wars.mp3": {
    "duration": "00:04:11",
    "artist": "Daft Punk",
    "album": "Tron: Legacy (Cd1)",
    "track": "17",
    "title": "Disc Wars"
  },
  "/data/Music/Keith Kouna/Les ann\u00e9es monsieur/07 - Godichons.mp3": {
    "duration": "00:05:09",
    "artist": "Keith Kouna",
    "album": "Les ann\u00e9es monsieur",
    "track": "7",
    "title": "Godichons"
  },
  "/data/Music/Daft Punk/Tron_ Legacy (Cd1)/1-07 Rinzler.mp3": {
    "duration": "00:02:17",
    "artist": "Daft Punk",
    "album": "Tron: Legacy (Cd1)",
    "track": "07",
    "title": "Rinzler"
  },
  "/data/Music/Keith Kouna/Les ann\u00e9es monsieur/10 - Le Tape.mp3": {
    "duration": "00:06:06",
    "artist": "Keith Kouna",
    "album": "Les ann\u00e9es monsieur",
    "track": "10",
    "title": "Le Tape"
  },
  "/data/Music/Keith Kouna/Les ann\u00e9es monsieur/09 - L'or.mp3": {
    "duration": "00:05:05",
    "artist": "Keith Kouna",
    "album": "Les ann\u00e9es monsieur",
    "track": "9",
    "title": "L'or"
  }
}
  
from functools import wraps

def dbsorter(func):
    @wraps(func)
    def wrapper(db, reverse=False):
        return OrderedDict(sorted(
            db.items(), reverse=bool(reverse), key=lambda item: func(*item)))
    return wrapper

@dbsorter
def by_artist_and_track(key, data):
    return data['artist'], int(data['track'])

sdb = by_artist_and_track(db)
for key in sdb:
    print(key)
print()

@dbsorter
def by_duration(key, data):
    h, m, s = (int(x) for x in data['duration'].split(':'))
    return (h, m, s)

sdb = by_duration(db, reverse=True)
for key in sdb:
    print(key)

Output:
/data/Music/Daft Punk/Tron_ Legacy (Cd1)/1-07 Rinzler.mp3
/data/Music/Daft Punk/Tron_ Legacy (Cd1)/1-17 Disc Wars.mp3
/data/Music/Keith Kouna/Les années monsieur/07 - Godichons.mp3
/data/Music/Keith Kouna/Les années monsieur/09 - L'or.mp3
/data/Music/Keith Kouna/Les années monsieur/10 - Le Tape.mp3

/data/Music/Keith Kouna/Les années monsieur/10 - Le Tape.mp3
/data/Music/Keith Kouna/Les années monsieur/07 - Godichons.mp3
/data/Music/Keith Kouna/Les années monsieur/09 - L'or.mp3
/data/Music/Daft Punk/Tron_ Legacy (Cd1)/1-17 Disc Wars.mp3
/data/Music/Daft Punk/Tron_ Legacy (Cd1)/1-07 Rinzler.mp3