python - 如何设置计时器来控制循环内的函数调用？

Question

我有这个函数，可以播放Spotify:

#a function to play Spotify
def play(id_):
    print 'playing', id_
    os.system("osascript -e 'tell application \"Spotify\" to play track \"%s\"'" % (id_,))

接下来的循环会遍历所有播放列表歌曲，获取所有可播放的id(foreign_id)，将它们传递给 play(id_),

并将每首歌曲duration传递给time.sleep()以停止循环，直到每首歌曲结束，再次重复循环:

for i, song in enumerate(song_playlist):
            #we need to track each song id
            song_id = song_playlist[i]['id']
            #in order to get song 'duration', access 'song/profile response' and pass the id as an argument
            response_profile = en.get('song/profile', id=song_id, bucket="audio_summary")
            song_profile = response_profile['songs']
            dur = song_profile[0]['audio_summary']['duration']
            #convert to miliseconds     
            dur *= 1000
            print int(round(dur))                           
            #now we access each song 'foreign_id' 
            for track in song:
                track = song['tracks'][i]
                track_id = track['foreign_id'].replace('-WW', '')           
            print '{0} {2} {1}'.format(i, song['artist_name'], song['title'])
            #call the function for each track
            play(track_id) #CALL FUNCTION HERE
            time.sleep(int(round(dur))) # SET INTERVAL CALL TO EACH SONG DURATION

但是，只播放一首歌，递归就消失了。

如何更正代码，以便让函数按顺序播放所有轨道，仅运行代码一次？

Answer 1

看起来 play(track_id) 应该位于 for track in Song 循环内。您需要将其缩进 1 级。

for i, song in enumerate(song_playlist):
    # Code as before ...
    for track in song:
        track = song['tracks'][i]
        track_id = track['foreign_id'].replace('-WW', '')           
        print '{0} {2} {1}'.format(i, song['artist_name'], song['title'])
        play(track_id) #CALL FUNCTION HERE
    time.sleep(int(round(dur))) # SET INTERVAL CALL TO EACH SONG DURATION