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prepare_data.py
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/
prepare_data.py
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'''
Created on 09.04.2018
@author: Iman
@author: Malte
'''
import pandas as pd
import os
import json
from helper import inout
# data folder
SRC_FOLDER = 'data/original/'
TARGET_FOLDER = 'data/data_formatted/'
# where to save the result file
PLAYLISTS_FILE = TARGET_FOLDER + 'playlists.csv'
TRACKS_FILE = TARGET_FOLDER + 'tracks.csv'
ARTISTS_FILE = TARGET_FOLDER + 'artists.csv'
PLAYLISTS_TRACKS_FILE = TARGET_FOLDER + 'playlists_tracks.csv'
# data dictionaries
ri_track = [0]
ri_track_map = {}
ri_artist = [0]
ri_artist_map = {}
ri_pos = [0]
playlists = {}
playlists['playlist_id'] = []
playlists['name'] = []
playlists['num_tracks'] = []
playlists['num_artists'] = []
playlists['num_albums'] = []
playlists['num_followers'] = []
playlists['num_edits'] = []
playlists['duration_ms'] = []
playlists['modified_at'] = []
playlists['collaborative'] = []
playlists['description'] = []
tracks = {}
tracks['track_id'] = []
tracks['track_uri'] = []
tracks['track_name'] = []
tracks['artist_id'] = []
tracks['album_uri'] = []
tracks['duration_ms'] = []
tracks['album_name'] = []
artists = {}
artists['artist_id'] = []
artists['artist_uri'] = []
artists['artist_name'] = []
playlists_tracks = {}
playlists_tracks['playlist_id'] = []
playlists_tracks['track_id'] = []
playlists_tracks['artist_id'] = []
playlists_tracks['pos'] = []
def getid( org, map, ril ):
if not org in map:
ril[0] += 1
map[org] = ril[0]
return map[org]
if __name__ == '__main__':
results = pd.DataFrame([])
filenames = os.listdir(SRC_FOLDER)
first_track = True
for i in range(0, len(filenames)):
# for filename in filenames:
if filenames[i].startswith("mpd.slice.") and filenames[i].endswith(".json"):
fp = os.sep.join((SRC_FOLDER, filenames[i]))
josn_str = json.load(open(fp))
playlists_str = josn_str['playlists']
# load json file in a dataframe
df_file_playlists = pd.DataFrame.from_dict(playlists_str)
#iterate over playlists
for index, row in df_file_playlists.iterrows():
playlist_id = row['pid']
playlists['playlist_id'].append( playlist_id )
playlists['name'].append( row['name'] )
playlists['num_tracks'].append( row['num_tracks'] )
playlists['num_artists'].append( row['num_artists'] )
playlists['num_albums'].append(row['num_albums'] )
playlists['num_followers'].append( row['num_followers'] )
playlists['num_edits'].append( row['num_edits'] )
playlists['duration_ms'].append( row['duration_ms'] )
playlists['modified_at'].append( row['modified_at'] )
playlists['collaborative'].append( row['collaborative'] )
playlists['description'].append( row['description'] )
playlist_tracks = row['tracks']
for track in playlist_tracks:
artist_uri = track['artist_uri']
last = ri_artist[0]
artist_id = getid( artist_uri, ri_artist_map, ri_artist )
if artist_id == last + 1:
artists['artist_id'].append( artist_id )
artists['artist_uri'].append( artist_uri )
artists['artist_name'].append( track['artist_name'] )
track_uri = track['track_uri']
last = ri_track[0]
track_id = getid( track_uri, ri_track_map, ri_track )
pos = track['pos']
if track_id == last + 1:
tracks['track_id'].append( track_id )
tracks['track_uri'].append( track_uri)
tracks['track_name'].append( track['track_name'] )
tracks['artist_id'].append( artist_id )
tracks['album_uri'].append( track['album_uri'] )
tracks['duration_ms'].append( track['duration_ms'] )
tracks['album_name'].append( track['album_name'] )
playlists_tracks['playlist_id'].append( playlist_id )
playlists_tracks['track_id'].append( track_id )
playlists_tracks['artist_id'].append( artist_id )
playlists_tracks['pos'].append( pos )
if (i%10==0):
print('done for', i, 'files from 1000')
df_playlists = pd.DataFrame.from_dict(playlists)
df_tracks = pd.DataFrame.from_dict(tracks)
df_artists = pd.DataFrame.from_dict(artists)
df_playlists_tracks = pd.DataFrame.from_dict(playlists_tracks)
print('saving files...')
inout.ensure_dir( PLAYLISTS_FILE )
df_playlists.to_csv(PLAYLISTS_FILE, index=False)
df_tracks.to_csv(TRACKS_FILE, index=False)
df_artists.to_csv(ARTISTS_FILE, index=False)
df_playlists_tracks.to_csv(PLAYLISTS_TRACKS_FILE, index=False)
inout.convert_feather(TARGET_FOLDER)