緩存JSON的類定義

我想定義一個類，它返回帶有歌曲標題，曲目號和流派類型的字典（這是來自特定藝術家對歌曲的iTunes API請求）。目前，當我在終端中運行我的文件時，沒有任何內容正在返回（我沒有收到語法錯誤或回溯）。我期待看到一個帶有曲目名稱，曲目編號和另類風格的詞典。任何幫助將是偉大的！緩存JSON的類定義

class Song(): 
def __init__(self, song_dict={}): 
    self.trackName = song_dict["trackName"] 
    self.trackNumber = song_dict["trackNumber"] 
    self.genre = song_dict["primaryGenreName"]["alternative"] 
def __str__(self): 

return "{} by {}".format(self.trackName,self.trackNumber,self.genre)

緩存JSON：

{"http://itunes.apple.com/searchcountry-US_entity-song_format-json_term-bon+iver": {"resultCount": 50, "results": [{"collectionExplicitness": "notExplicit", "releaseDate": "2011-06-21T07:00:00Z", "currency": "USD", "artistId": 273428126, "previewUrl": "http://audio.itunes.apple.com/apple-assets-us-std-000001/AudioPreview71/v4/29/b7/6d/29b76dbc-c7c2-a528-98c0-88250c90d61f/mzaf_8791054078902679680.plus.aac.p.m4a", "trackPrice": 1.29, "isStreamable": true, "trackViewUrl": "https://itunes.apple.com/us/album/holocene/id438685974?i=438685989&uo=4", "collectionName": "Bon Iver", "collectionId": 438685974, "trackId": 438685989, "collectionViewUrl": "https://itunes.apple.com/us/album/holocene/id438685974?i=438685989&uo=4", "trackCount": 10, "trackNumber": 3, "discNumber": 1, "collectionPrice": 9.99, "trackCensoredName": "Holocene", "trackName": "Holocene", "trackTimeMillis": 336613, "primaryGenreName": "Alternative", "artistViewUrl": "https://itunes.apple.com/us/artist/bon-iver/id273428126?uo=4", "kind": "song", "country": "USA", "wrapperType": "track", "artworkUrl100": "http://is3.mzstatic.com/image/thumb/Music/v4/f6/41/9b/f6419bd5-7fa7-6046-04d0-fcae6ecf9d96/source/100x100bb.jpg", "collectionCensoredName": "Bon Iver", "artistName": "Bon Iver", "artworkUrl60": "http://is3.mzstatic.com/image/thumb/Music/v4/f6/41/9b/f6419bd5-7fa7-6046-04d0-fcae6ecf9d96/source/60x60bb.jpg", "trackExplicitness": "notExplicit", "artworkUrl30": "http://is3.mzstatic.com/image/thumb/Music/v4/f6/41/9b/f6419bd5-7fa7-6046-04d0-fcae6ecf9d96/source/30x30bb.jpg", "discCount": 1}, {"contentAdvisoryRating": "Explicit", "collectionExplicitness": "explicit", "releaseDate": "2010-11-22T08:00:00Z", "currency": "USD", "artistId": 2715720, "previewUrl": "http://a1044.phobos.apple.com/us/r30/Music/ac/5a/7b/mzm.wurlfubj.aac.p.m4a", "trackPrice": 1.29, "isStreamable": true, "trackViewUrl": "https://itunes.apple.com/us/album/monster-feat-jay-z-rick-ross-nicki-minaj-bon-iver/id403822142?i=403822318&uo=4", "collectionName": "My Beautiful Dark Twisted Fantasy", "collectionId": 403822142, "trackId": 403822318, "collectionViewUrl":

來源

2017-04-14 sammie1991

你還沒有說過你遇到了什麼問題。這個代碼至少有四件事是錯誤的：縮進，從init方法返回的東西，在song_dict和它的鍵之間的不必要的等號，以及可變的默認參數。 –

兩件事情：

首先，你有一些等號（意思是，分配），你並不需要/想。這：

self.trackName =song_dict["trackName"] 
self.trackNumber=song_dict=["trackNumber"] 
self.primaryGenreName =song_dict=["primaryGenreName"]

應該成爲這樣的：

self.trackName = song_dict["trackName"] 
self.trackNumber = song_dict["trackNumber"] 
self.primaryGenreName = song_dict["primaryGenreName"]

接下來，你不從在Python類構造函數（__init__）返回的東西。所以刪除return語句。

來源

2017-04-14 20:17:55

感謝您的提示。我刪除了等號和返回語句。再建議？謝謝！ – sammie1991

緩存JSON的類定義

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