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私は Python 経由で MusicBrainz API を使用しようとしていますが、特定の条件が満たされた後にループが壊れない理由を理解しようとして、悲惨な時間を過ごしています。JSON を取得する URL を介して曲の長さと音響 ID を渡しています。JSONが無効かどうかはわかりませんが、フォーマットされた出力を再生しています。私が立ち往生している部分は、曲の長さが返された JSON の長さと一致するときにコードを壊すように指示したにもかかわらず、長さと一致した残りのデータを引き続き表示します。また、メインのデータ要素の 1 つで KeyError が発生しています。助けてください！

使用されている Python コード:

import urllib2
import urllib
import simplejson
import json
import pprint

duration = 266
output = 'AQABz0q6JJFknHgOHH0q9DyQw8lxIzmaLzl6HHyE7yO6G4dP9Mc3JDry4FJR5RfIvccWH0d_PD-O63gi9KTQPjme4-uDxl04hMqcQf0RfXgmKWDSDD8aF9dYTDl5hEPy46gnHY-iPEWZEWfw42

-

SIHZiQQ9xLR90ckzRw_mNez_aHZeeQnlIIdfxyHieBLl0HC_Y_Ajpo3lxnMf7DJUleJKGhk_Bw7mCvAqS53j1CE30BFdmYqeOL3pQ8vgeNAqzfKjMx_jRJ0dTMT_yZziuIE6ko1kSzcG7BMZzCU13JTglGZ9x

pcVJKgjlHAlfnFGONw8uHo-xd8Pn46DGDMmeI-fx5Vid6LjwXCLKh2h-5IPy8LiP3iUsaoGU9PixE3_wZEcyqw0O_MPhiugffMcfxNSJJMcbfMqagtMDH9eP5-AfJF-OMMtRUTl4JWiebA-

MnsazIzmDHP9QHU2DL-CTTMGHIfihXwqe6PjR_ugPnTlyXDmehGmCW5KDUHkO8Qg7HDPBJ8dP_MGlBHp-HD8uRuBewnoxvtCTwkvUCaeOH01MWA9ON0hupItyNJNSPELzZ-hFxAp1DXJ8nEolQu-

PtGLwED_gmMfzG3fw9Hhx3mhe1Do-o5KmVIG1M8MTIdmP8D_MMagTUsaP9sd_WKg-H6eRejm-J4TOHHPyEFVPkN9Ri-HA_A6aHlcu4Tn6KHiM99iRujGe42iO48eP-0WTRoOToxb-

o9nR99jR1EF_hImzrEEyJXyGiRnTwx8qo9E4H1VzPMKDvoMd-gjlLIS2C442UmhzDc-O-

kVDIdePZ0dvorlwZbrw5McTP5i8Hc1jXEH0vDiEP9ilK7iUQ6qkY3qQPsNFNJoY462JL_gZoTlC10geTc5xqRPxDMWOivIOMj_e402RPEGu4R2ancKfww9YJfB3CdP34D6eHiG1FXPESRxcHf6hPfh6nJskZH

Ke4DTW4w8-4wkf4sqHnkd6JCcuGl6SPCgZnMeYJiPuhbh1RGIeJMSN_3imwi4HeImeo5SOS7ij5HiMK7oQnhf0C-l0_KjUrPhx7_hxXDpC2IGmPMV_FT-

Rq8aTAukX_BfU_EXOxXCTLMQlC89yPPnRZEGeC82kRGSgMzx6Isx0Ia4uPJEY9PLR9Hg04w90mEN-CfuONvrhH4ezDQ8TjEeYc9CeHmGqHD8qZ4dVnEc_41R0NAqPaj2aNQ-eIm1zI-dxZzme-

HjQkuiLH36RM0j4oD8-EueDLjE8EvUyfBc-hhF-

C8n4IH1QncELRoFTgjADFCCKdIOIBYQZ0UABgDAnsAGCQuGEAgwhwACGDBFgMIIAAQKsMIQY4QARQFAAiJGeEQOoBEgpEZxQAAEipDAOEYCEAU4AZAEBQAoYDGFAMGKIwIIRgIg4jiDFlIAAIEIEBMwwBJQkX

hiohHEGIKAkcsIp4RAigAHBgPKSAKIIAoAxgJBjlhhkCIDAIAQkIgYAKSyQCDpCARIESWUAMYQ4YQGzGhhkADBAEOIEMAAhZRlQRgGkBBECMeAIQYAghxBAChAigANEIWKQcEbB5ZxlChGKACCAEKWEsIIyiw

RiTAABgBNKAAIIQMQhJCCoTAgliAIAICYwAIRZowRgxCllDBOAAEGABQIRoQ0ABIFgHCEECSEUMhQBAhkDwABCBANIACSABMxoAYGEBFRCASBEGAMBEMAIxBQQABkkLALAAIaIYIwggoACShgEjLEKAQ0AQsY

goBwAAImMFBBIQQUUQcgQARQI'
data = {}
data['client'] = '8XaBELgH'
data['format'] = 'json'
data['meta'] = '2'
data['duration'] = str(duration)
data['fingerprint'] = output
resp = urllib2.urlopen('http://api.acoustid.org/v2/lookup', urllib.urlencode(data))
str_to_load = resp.read()
json = simplejson.loads(str_to_load)
#pprint.pprint(json)
for result in json['results']:
    for recording in result['recordings']:
        for track in recording['tracks']:
            track_artist = ''
            for artist in track['artists']:
                try:
                    track_artist += repr(artist['name']) + ' '
                except:
                    track_artist = ''
            #print str(track['duration']) + '-' + track['medium']['release']['title'] + '-' + track['title'] + '-' + track_artist
            if str(track['duration']) == str(duration):
                print 'Matched:' + str(track['duration']) + '-' + track['medium']['release']['title'] + '-' + track['title'] + '-' + track_artist
                break

返された JSON:

{
    "status": "ok",
    "results": [{
        "recordings": [{
            "duration": 264,
            "tracks": [{
                "duration": 264,
                "position": 7,
                "medium": {
                    "release": {
                        "id": "036ce98e-0397-4ddb-97ff-e6784fdd21a4",
                        "title": "Live in Paris"
                    },
                    "position": 1,
                    "track_count": 10,
                    "format": "CD"
                },
                "artists": [{
                    "id": "3cb25fb2-5547-4b05-adec-1a5e37830d46",
                    "name": "Lionel Richie"
                }],
                "title": "Sail On"
            }],
            "id": "0083c88e-1ca2-484e-b1ff-d384358942bb"
        }, {
            "duration": 268,
            "tracks": [{
                "duration": 268,
                "position": 12,
                "medium": {
                    "release": {
                        "id": "9c0a98e8-da23-49cf-a6ae-df27340deebb",
                        "title": "Love Songs"
                    },
                    "position": 1,
                    "track_count": 16,
                    "format": "CD"
                },
                "artists": [{
                    "id": "60d41417-feda-4734-bbbf-7dcc30e08a83",
                    "name": "Diana Ross"
                }, {
                    "id": "3cb25fb2-5547-4b05-adec-1a5e37830d46",
                    "name": "Lionel Richie"
                }],
                "title": "Endless Love"
            }],
            "id": "07be8b05-a1cb-4e88-8217-2ef5e0dafcb3"
        }, {
            "duration": 267,
            "tracks": [{
                "duration": 267,
                "position": 2,
                "medium": {
                    "release": {
                        "id": "a4c1dce4-0e16-483e-95de-aabff4378711",
                        "title": "Top 40 Hitdossier 1981-1982"
                    },
                    "position": 1,
                    "track_count": 20
                },
                "artists": [{
                    "id": "60d41417-feda-4734-bbbf-7dcc30e08a83",
                    "name": "Diana Ross"
                }, {
                    "id": "3cb25fb2-5547-4b05-adec-1a5e37830d46",
                    "name": "Lionel Richie"
                }],
                "title": "Endless Love"
            }],
            "id": "1fb13442-b0e7-4891-97de-255ba7e8730f"
        }, {
            "duration": 263,
            "tracks": [{
                "duration": 263,
                "position": 16,
                "medium": {
                    "release": {
                        "id": "add4c09f-b9f3-4e3f-b36b-22f30309ce2b",
                        "title": "Steve Wright's Sunday Love Songs, Volume 2"
                    },
                    "position": 1,
                    "track_count": 22,
                    "format": "CD"
                },
                "artists": [{
                    "id": "60d41417-feda-4734-bbbf-7dcc30e08a83",
                    "name": "Diana Ross"
                }, {
                    "id": "3cb25fb2-5547-4b05-adec-1a5e37830d46",
                    "name": "Lionel Richie"
                }],
                "title": "Endless Love"
            }],
            "id": "20df4da3-005e-4bde-9337-46925e709110"
        }, {
            "duration": 264,
            "tracks": [{
                "duration": 264,
                "position": 2,
                "medium": {
                    "release": {
                        "id": "d23d377b-b69a-424b-856c-b78dfde11feb",
                        "title": "Always And Forever (disc 1)"
                    },
                    "position": 1,
                    "track_count": 20,
                    "format": "CD"
                },
                "artists": [{
                    "id": "3cb25fb2-5547-4b05-adec-1a5e37830d46",
                    "name": "Lionel Richie"
                }],
                "title": "Endless Love"
            }],
            "id": "2cf76055-5a41-4a39-82ba-611b7142ab91"
        }, {
            "duration": 265,
            "tracks": [{
                "duration": 265,
                "position": 9,
                "medium": {
                    "release": {
                        "id": "3bc3d08b-7e50-47d0-951d-de95a10e1ee8",
                        "title": "The Love Album II"
                    },
                    "position": 1,
                    "track_count": 20,
                    "format": "CD"
                },
                "artists": [{
                    "id": "60d41417-feda-4734-bbbf-7dcc30e08a83",
                    "name": "Diana Ross"
                }, {
                    "id": "3cb25fb2-5547-4b05-adec-1a5e37830d46",
                    "name": "Lionel Richie"
                }],
                "title": "Endless Love"
            }],
            "id": "33f02920-5832-490d-bf5f-3cce793925bf"
        }....too big to display here..

ここに出力を貼り付けてもかまいません..

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1 に答える 1

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pythonのドキュメントから、

break ステートメントは、C のように、囲んでいる最小の for または while ループから抜け出します。

あなたの場合

for track in recording['tracks']:

コードを関数に入れて return を使用してみてください:

def find_it(json, duration):
  for result in json['results']:
      for recording in result['recordings']:
          for track in recording['tracks']:
              track_artist = ''
              for artist in track['artists']:
                  try:
                      track_artist += repr(artist['name']) + ' '
                  except:
                      track_artist = ''
              #print str(track['duration']) + '-' + track['medium']['release']['title'] + '-' + track['title'] + '-' + track_artist
              if str(track['duration']) == str(duration):
                return track, track_artist
  return None, None

track, track_artist = find_it(json, duration)
print 'Matched:' + str(track['duration']) + '-' + track['medium']['release']['title'] + '-' + track['title'] + '-' + track_artist
于 2013-01-21T19:49:29.927 に答える