TypeErrorの取得：body []が空の場合、リストインデックスはstrではない整数またはスライスでなければなりません

Question

これは、公開されているメソッドを使用して、musixmatch APIを使用してトラックの歌詞を取得します。トラックは、関連する歌詞がある場合、この形式で

json_obj = json.loads(raw.decode('utf-8')) 
    body = json_obj["message"]["body"]["lyrics"]["lyrics_body"] 

プリント（json_obj）戻り：このメソッドは、この部分を有する

{'message': {'header': {'status_code': 200, 'execute_time': 0.0032379627227783}, 'body': {'lyrics': {'lyrics_id': 1290130, 'can_edit': 0, 'locked': 0, 'action_requested': '', 'verified': 0, 'restricted': 1, 'instrumental': 0, 'explicit': 0, 'lyrics_body': '', 'lyrics_language': 'en', 'lyrics_language_description': 'English', 'script_tracking_url': 'https://tracking.musixmatch.com/t1.0/m_js/e_1/sn_0/l_1290130/su_0/tr_3vUCAELvdbv2u68t6EhkMnd-8HjFVDR8ySJtVDvx1wu2t7bIHzQn4QjBnewHmPfaFosJFYkWv3dp_LyRwBhUrXjOsX9TA-28yzdsLebCvaG9shILvno8F94Mm6EuA6PvOiTKdFVL6hW2DSHd2uQQbOF-URNHli0NCOG2mnJS7i_pRvQM6jbzTs8GWGmfkz6SPG6SiRAw7OD1_ALUcvL6DWgqTDzzQyn1mxFzSyUWB5ddJTf3oTmgBoRKQKJJqiO6h2S6T40I73gio9TzqXUMeTjB7jKbL7pm-ma6s4zx-uAlRzVKvyEMxjJGks6p2CKu_NE3MZ26VcV4EVhaL0QcXsmVW49T064RtrZFc4qY9gqHoc_wreBVUPoftX1SWDPGzG4HZOiRXpj-V_YIvaLA2QAVsAVcBkwi9Zmb0onjsHTbknSmzO-6kcez0zrFc44LZOQ45of1eATGIVI/', 'pixel_tracking_url': 'https://tracking.musixmatch.com/t1.0/m_img/e_1/sn_0/l_1290130/su_0/tr_3vUCAAVtFUMcReVeKMMElPrsIdyf5IcOQyLMIduxSpy9U549RTNLfGorynAbS03DhldhcSFwWs_f9EiFdRepDw_HGQFZC6-hNtxts2M9eU1uD2Ga8RXdRq9pgm29WoAj8zcfH45WsO-tAfyA3oajqe-momfl2S4n51WgrBj4RxpmZ3DhrilGRO1Rhq5rqTyXRLG86fM7Hi0Bh2hXrXg115SiPywxjuMzLR2DMmGvu_Q--jjtFU38jTurZCsdtJ8slsdpvUzUo5Rs0EKdxboiopgPdTScdSQ-J3NRlXq8CFlK0j78ZMGo8KI9ZwdfMag5gPo5hI56PdcsAkfLkmvGjE2einZMruGrZVy08cZxAX7_ZdhXuLUY3RvleHog089sBJnzXDVqi7zb2yZSxrxYENQZuSR7KjR1fDN45I18ingQsAHXy18mJ6CUzWkrzwpV0-XAeNBe2d5mG9M/', 'html_tracking_url': 'https://tracking.musixmatch.com/t1.0/m_html/e_1/sn_0/l_1290130/su_0/tr_3vUCAEHn0YKFfsSIWi8uC0aMlSrJxMwAjYKks94IRU-wF13uNtElVESehNa14ZOa5h19bOKSN10QRhFF4V-Jwo6DLkoN5VVBVDpw9pqL5Ff0--pA2EUtqzvjZb3Z35J2V51RY9AFv6VYWgQ6Nm7ijSbRcbnjyqB3rvCbhUNqN_egIfyVPkDCjZZnyFIs5Vt8teA7zLE2ms5EDF6NphXfezUcsDZfN8hBtT8lvd_EjunDSKs7QaCMHmi8YV7aSiLWyFeQKBzKWm-YRq2z9kyXtcreXlGagr6UHazj88UTK_LO_TzT99BO4XKJwmQ1ARm8-c4nug9kxUic3EvDxS0CNclEXAuKdKpzZvE25PQZUb_dCyPNvCVHHV4C1XtlmOVXoRET6fuguSHlA7Hg7TqDo_PP8cbR-Q4_VeromQ4evewwzWrrNQQSA4VX0Z78Ll5nKF9lYVa5wWQTWi8/', 'lyrics_copyright': "Unfortunately we're not authorized to show these lyrics.", 'writer_list': [], 'publisher_list': [], 'backlink_url': 'https://www.musixmatch.com/lyrics/Bruce-Springsteen/No-Surrender?utm_source=application&utm_campaign=api&utm_medium=none%3A1409616623501', 'updated_time': '2010-06-29T03:43:49Z'}}}} 

をしかし、トラックには歌詞がない場合には、本体と返します空：

{'message': {'header': {'status_code': 404, 'execute_time': 0.0011160373687744}, 'body': []}} 
Traceback (most recent call last): 

と体が空の場合、それが表示されます。

Traceback (most recent call last): 
    File "/Users/ozzy/PycharmProjects/semantic/semantic.py", line 240, in <module> 
    tracks[ID]['Lyric'] = song_lyric(title, tracks[ID]['Artist']) 
    File "/Users/ozzy/PycharmProjects/semantic/semantic.py", line 29, in song_lyric 
    body = json_obj["message"]["body"]["lyrics"]["lyrics_body"] 
TypeError: list indices must be integers or slices, not str 

を

が使用して、このイムを解決するには、次の

if json_obj["message"]["body"] != "": 
      print(json_obj) 
      body = json_obj["message"]["body"]["lyrics"]["lyrics_body"] 

しかし、その作業はありませんが、私は同じ問題を取得します。なぜなのかご存知ですか？

完全な方法：

def song_lyric(song_name,artist_name): 
    while True: 
     querystring = apiurl_musixmatch + "matcher.lyrics.get?q_track=" + urllib.parse.quote(song_name) + "&q_artist=" + urllib.parse.quote(artist_name) +"&apikey=" + apikey_musixmatch + "&format=json&f_has_lyrics=1" 
     #matcher.lyrics.get?q_track=sexy%20and%20i%20know%20it&q_artist=lmfao 
     request = urllib.request.Request(querystring) 
     #request.add_header("Authorization", "Bearer " + client_access_token) 
     request.add_header("User-Agent", "curl/7.9.8 (i686-pc-linux-gnu) libcurl 7.9.8 (OpenSSL 0.9.6b) (ipv6 enabled)") #Must include user agent of some sort, otherwise 403 returned 
     while True: 
      try: 
       response = urllib.request.urlopen(request, timeout=4) #timeout set to 4 seconds; automatically retries if times out 
       raw = response.read() 
       #print(raw) 
      except socket.timeout: 
       print("Timeout raised and caught") 
       continue 
      break 
     json_obj = json.loads(raw.decode('utf-8')) 
     if json_obj["message"]["body"] != "": 
      print(json_obj) 
      body = json_obj["message"]["body"]["lyrics"]["lyrics_body"] 
      copyright = json_obj["message"]["body"]["lyrics"]["lyrics_copyright"] 
      tracking_url = json_obj["message"]["body"]["lyrics"]["html_tracking_url"] 
      if(tracking_url!= ""): 
       #print(body) 
       #print(tracking_url) 
       lyrics_tracking(tracking_url) 
       return (body + "\n\n" +copyright) 
      else: 
       return "None" 
     else: 
      return "None" 

def lyrics_tracking(tracking_url): 
    while True: 
     querystring = tracking_url 
     request = urllib.request.Request(querystring) 
     #request.add_header("Authorization", "Bearer " + client_access_token) 
     request.add_header("User-Agent", "curl/7.9.8 (i686-pc-linux-gnu) libcurl 7.9.8 (OpenSSL 0.9.6b) (ipv6 enabled)") #Must include user agent of some sort, otherwise 403 returned 
     try: 
      response = urllib.request.urlopen(request, timeout=4) #timeout set to 4 seconds; automatically retries if times out 
      raw = response.read() 
     except socket.timeout: 
      print("Timeout raised and caught") 
      continue 
     break 
     print(raw) 

Answer 1

あなたの問題はjson_obj["message"]["body"]が[]かもしれないが、あなたは""（空の文字列）をテストすることです[]（空のリスト）ではありません。したがって、[]をテストしてください。