Python JSON KeyError，用于分析的对象中不缺少的键

Question

我使用Python（2.X）对从RiotGames LoL API获取的JSON数据进行爬网和解析，遇到了一个奇怪的错误。在

我正在加载json数据并逐属性读取数据attr，这非常好，直到我找到了一个attr，它显然位于我试图从中提取它的对象中，但却导致Python抛出一个KeyError，如下面的屏幕截图所示。在

下面是发生错误的代码片段。如您所见，我打印对象（用于调试目的），然后解析所有attr，这很好，但是由于未知原因在attr“doubleKills”处抛出一个keyror。希望你们能帮忙

def parseJSON(self, jsonDump):
    matchDetailDict =  dict()
    jsonobj = json.loads(jsonDump)

    matchId = jsonobj['matchId']
    tmpMatch = Match()
    tmpMatch.matchID = matchId

    tmpMatch.creationDate = jsonobj['matchCreation']
    tmpMatch.matchDuration = jsonobj['matchDuration']

    for participant, participantId in zip(jsonobj['participants'], jsonobj['participantIdentities']):
        stats = participant['stats']
        print stats
        tmpStats = MatchPlayerStats()
        tmpStats.playerID = participantId['player']['summonerId']
        tmpStats.matchID = matchId
        tmpStats.winner = stats['winner']
        tmpStats.kills = stats['kills']
        tmpStats.deaths = stats['deaths']
        tmpStats.assists = stats['assists']
        tmpStats.kda = (tmpStats.kills + tmpStats.assists)*1.0/max(tmpStats.deaths, 0.5) 
        tmpStats.visionWardsBoughtInGame = stats['visionWardsBoughtInGame']
        tmpStats.sightWardsBoughtInGame = stats['sightWardsBoughtInGame']
        tmpStats.championID = participant['championId']
        tmpStats.doubleKills = participant['doubleKills'] #KeyError here!
        tmpStats.firstBloodAssist = participant['firstBloodAssist']
        tmpStats.firstBloodKill = participant['firstBloodKill']
        tmpStats.killingSprees = participant['killingSprees']
        tmpStats.wardsKilled = participant['wardsKilled']
        tmpStats.wardsPlaced = participant['wardsPlaced']
        tmpStats.unrealKills = participant['unrealKills']

        matchDetailDict[tmpStats.playerID] = tmpStats

    tmpMatch.playerStats = matchDetailDict
    return tmpMatch

Answer 1

看起来您发布的终端上的JSON似乎来自stats，但您试图使用participant上的键。在

print 'doubleKills' in stats.keys()

应计算为True