lotsOfTracks.append(songList[i])

lotsOfArtists = []
for i, key in enumerate(user.get_artists()):
    if (i != 0) and (i % 50 == 0):
        fiftyArtists = ",".join(lotsOfArtists)
        fiftyArtists = fiftyArtists.strip()
        fiftyArtists = fiftyArtists.replace(" ", "")
        lotsOfArtists[:] = []
        response = session.get('https://api.spotify.com/v1/artists?ids=%s' %
                               fiftyArtists,
                               headers=header)
        currentArtists = response.json()
        for currentArtist in currentArtists["artists"]:
            genres = currentArtist["genres"]
            user.add_genre(genres, currentArtist["id"])
    else:
        lotsOfArtists.append(key)

listOfPlaylists = []
offset = 0
response = session.get(
    'https://api.spotify.com/v1/users/%s/playlists?offset=%d&limit=50' %
    (user_id, offset),
    headers=header)
currentPlaylists = response.json()
while len(currentPlaylists["items"]) > 0:
    offset += 50
    for playlist in currentPlaylists["items"]:
        playlistName = playlist["name"]
        playlistId = playlist["id"]