Python JSON不会打破循环

Question

我正在尝试通过python使用musicbrainzapi，并且正在痛苦地试图弄清楚为什么在满足某个条件后我的循环不会中断。我通过一个获取JSON的URL传递歌曲的持续时间和声音id。我不确定JSON是否是invaild，但我正在获取格式化输出。我遇到的问题是，尽管我告诉代码在歌曲的持续时间与返回的JSON的持续时间匹配时中断，但它仍然继续显示与持续时间匹配的其余数据。另外，我得到一个主要数据元素，这看起来不错的一个关键错误！请帮帮我！你知道吗

正在使用的Python代码：

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

返回的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..

请不要介意我把输出粘贴在这里。。你知道吗

Answer 1

从python's documentation

The break statement, like in C, breaks out of the smallest enclosing for or while loop.

对你来说

for track in recording['tracks']:

尝试将代码放入函数中并使用return:

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