playlist_diff.py

#!/usr/bin/env python3
"""
Print the tracks missing from one Spotify playlist to another.
Requires Playlist1.json from Spoify user data download.

Will Bennett (rivermont) 2023
"""

import json


def playlist_diff(list1, list2, data):
    for playlist in data['playlists']:
        if playlist['name'] == list1:
            list1_tracks = playlist['items']
        elif playlist['name'] == list2:
            list2_tracks = playlist['items']

    list1_tracks = set([i['track']['trackName']+i['track']['artistName'] for i in list1_tracks])
    list2_tracks = set([i['track']['trackName']+i['track']['artistName'] for i in list2_tracks])

    return list(list1_tracks - list2_tracks)


if __name__ == '__main__':
    playlist1 = 'Playlist title 1'
    playlist2 = 'Playlist title 2'
    target = 'Playlist1.json'

    with open(target, 'r') as file_:
        diff = playlist_diff(playlist1, playlist2, json.load(file_))

    print(json.dumps(diff, indent=4, sort_keys=True))