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我有这个功能可以audio_features从Spotipy.

def show_audio_features(artist):
    tids = []
    results = sp.recommendations(seed_artists = [artist['id']])
    for track in results['tracks']:
        tids.append(track['uri'])
        features = sp.audio_features(tids)
    return json.dumps(features, indent=4)

它打印：

12:51 - The Strokes
There, There - Radiohead
DARE - Gorillaz
Stand by Me - Oasis
Do You Realize?? - The Flaming Lips
The Scientist - Coldplay
Exit Music (For a Film) - Radiohead
Supremacy - Muse
[
    {
        "track_href": "https://api.spotify.com/v1/tracks/2rA36OZNb3LkvqcNro1ugK", 
        "analysis_url": "https://api.spotify.com/v1/audio-analysis/2rA36OZNb3LkvqcNro1ugK", 
        "energy": 0.776, 
        "liveness": 0.0884, 
        "tempo": 113.808, 
        "speechiness": 0.056, 
        "uri": "spotify:track:2rA36OZNb3LkvqcNro1ugK", 
        "acousticness": 0.0395, 
        "instrumentalness": 0.737, 
        "time_signature": 4, 
        "danceability": 0.693, 
        "key": 3, 
        "duration_ms": 319249, 
        "loudness": -9.804, 
        "valence": 0.666, 
        "type": "audio_features", 
        "id": "2rA36OZNb3LkvqcNro1ugK", 
        "mode": 1
    }, etc

但显然，这个输出是不可迭代的。如果我尝试

  for f in show_audio_features(artist):
     print (f[0])

我得到：

TypeError: 'NoneType' object is not iterable

有没有办法可以阻止该spotipy方法输出歌曲和艺术家，以便我可以遍历JSON数据？

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