这个是什么原因啊，我要怎样才能拿到parametersData里面的值
# coding=UTF-8
import json
str1 = '{"parametersElec":[{"parametersData":[{"recommendParamFlag":"X","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"001","coreFlag":"X","snparameterdesc":"品牌","snparameterVal":"施华洛世奇(SWAROVSKI)","snparameterCode":"000897","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"002","coreFlag":"X","snparameterdesc":"类别","snparameterVal":"项链","snparameterCode":"007642","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"003","coreFlag":"","snparameterdesc":"型号","snparameterVal":"Iconic Swan","snparameterCode":"001360","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"005","coreFlag":"","snparameterdesc":"产地","snparameterVal":"奥地利","snparameterCode":"000158","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"012","coreFlag":"X","snparameterdesc":"适用人群","snparameterVal":"女士","snparameterCode":"007741","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"013","coreFlag":"","snparameterdesc":"适用场景","snparameterVal":"宴会,生日,日常佩戴,婚礼,出游,表白,情人节","snparameterCode":"010693","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"X","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"014","coreFlag":"X","snparameterdesc":"材质","snparameterVal":"人造水晶","snparameterCode":"014315","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"015","coreFlag":"","snparameterdesc":"镶嵌材质","snparameterVal":"水晶","snparameterCode":"007756","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"}],"attrName":"主体"},{"parametersData":[{"recommendParamFlag":"","snparametersCode":"0002","explain":"","prmtExpositionDetailsLink":"","snsequence":"02","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"001","coreFlag":"X","snparameterdesc":"镶嵌方式","snparameterVal":"其它","snparameterCode":"011397","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"规格"},{"recommendParamFlag":"","snparametersCode":"0002","explain":"","prmtExpositionDetailsLink":"","snsequence":"02","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"003","coreFlag":"X","snparameterdesc":"风格","snparameterVal":"欧美风格","snparameterCode":"010369","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"规格"},{"recommendParamFlag":"","snparametersCode":"0002","explain":"","prmtExpositionDetailsLink":"","snsequence":"02","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"004","coreFlag":"","snparameterdesc":"形状","snparameterVal":"动物","snparameterCode":"007547","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"规格"}],"attrName":"规格"},{"parametersData":[{"recommendParamFlag":"X","snparametersCode":"0003","explain":"","prmtExpositionDetailsLink":"","snsequence":"03","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"001","coreFlag":"X","snparameterdesc":"用途","snparameterVal":"送恋人","snparameterCode":"014316","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"功能"}],"attrName":"功能"}],"knum":"","model":"","classes":"","isSuccess":"0","parametersBook":{},"isBook":"1","sericeFlag":false,"serice":"","paraInfo":{"knum":"","cccCode":"012200","recommendParameterList":[{"recommendParamFlag":"X","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"001","coreFlag":"X","snparameterdesc":"品牌","snparameterVal":"施华洛世奇(SWAROVSKI)","snparameterCode":"000897","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"X","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"014","coreFlag":"X","snparameterdesc":"材质","snparameterVal":"人造水晶","snparameterCode":"014315","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"X","snparametersCode":"0003","explain":"","prmtExpositionDetailsLink":"","snsequence":"03","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"001","coreFlag":"X","snparameterdesc":"用途","snparameterVal":"送恋人","snparameterCode":"014316","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"功能"}],"usedCarOriginalPrice":"","eleParameterList":[{"主体":[{"recommendParamFlag":"X","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"001","coreFlag":"X","snparameterdesc":"品牌","snparameterVal":"施华洛世奇(SWAROVSKI)","snparameterCode":"000897","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode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Swan","snparameterCode":"001360","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"005","coreFlag":"","snparameterdesc":"产地","snparameterVal":"奥地利","snparameterCode":"000158","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"012","coreFlag":"X","snparameterdesc":"适用人群","snparameterVal":"女士","snparameterCode":"007741","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"013","coreFlag":"","snparameterdesc":"适用场景","snparameterVal":"宴会,生日,日常佩戴,婚礼,出游,表白,情人节","snparameterCode":"010693","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"X","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"014","coreFlag":"X","snparameterdesc":"材质","snparameterVal":"人造水晶","snparameterCode":"014315","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"015","coreFlag":"","snparameterdesc":"镶嵌材质","snparameterVal":"水晶","snparameterCode":"007756","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"}]},{"规格":[{"recommendParamFlag":"","snparametersCode":"0002","explain":"","prmtExpositionDetailsLink":"","snsequence":"02","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"001","coreFlag":"X","snparameterdesc":"镶嵌方式","snparameterVal":"其它","snparameterCode":"011397","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"规格"},{"recommendParamFlag":"","snparametersCode":"0002","explain":"","prmtExpositionDetailsLink":"","snsequence":"02","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"003","coreFlag":"X","snparameterdesc":"风格","snparameterVal":"欧美风格","snparameterCode":"010369","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"规格"},{"recommendParamFlag":"","snparametersCode":"0002","explain":"","prmtExpositionDetailsLink":"","snsequence":"02","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"004","coreFlag":"","snparameterdesc":"形状","snparameterVal":"动物","snparameterCode":"007547","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"规格"}]},{"功能":[{"recommendParamFlag":"X","snparametersCode":"0003","explain":"","prmtExpositionDetailsLink":"","snsequence":"03","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"001","coreFlag":"X","snparameterdesc":"用途","snparameterVal":"送恋人","snparameterCode":"014316","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"功能"}]}],"coreParameterList":[{"recommendParamFlag":"X","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"001","coreFlag":"X","snparameterdesc":"品牌","snparameterVal":"施华洛世奇(SWAROVSKI)","snparameterCode":"000897","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"002","coreFlag":"X","snparameterdesc":"类别","snparameterVal":"项链","snparameterCode":"007642","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"012","coreFlag":"X","snparameterdesc":"适用人群","snparameterVal":"女士","snparameterCode":"007741","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"X","snparametersCode":"0001","explain":"","prmtExpositionDetailsLink":"","snsequence":"01","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"014","coreFlag":"X","snparameterdesc":"材质","snparameterVal":"人造水晶","snparameterCode":"014315","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"主体"},{"recommendParamFlag":"","snparametersCode":"0002","explain":"","prmtExpositionDetailsLink":"","snsequence":"02","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"001","coreFlag":"X","snparameterdesc":"镶嵌方式","snparameterVal":"其它","snparameterCode":"011397","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"规格"},{"recommendParamFlag":"","snparametersCode":"0002","explain":"","prmtExpositionDetailsLink":"","snsequence":"02","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"003","coreFlag":"X","snparameterdesc":"风格","snparameterVal":"欧美风格","snparameterCode":"010369","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"规格"},{"recommendParamFlag":"X","snparametersCode":"0003","explain":"","prmtExpositionDetailsLink":"","snsequence":"03","prmtExpositionText":"","prmtGroupImgUrl":"","snparameterSequence":"001","coreFlag":"X","snparameterdesc":"用途","snparameterVal":"送恋人","snparameterCode":"014316","measureUnit":"","recomExpositionImgLink":"","snparametersDesc":"功能"}],"smartFlag":false,"usedCarPrice":"","model":"","productName":"","brandName":"","visualParameterList":{},"serice":"","KTSize":"","sericeFlag":false,"classes":"","TVSize":"","cccFlag":false}}'
json = json.loads(str1)
parametersData = json['parametersElec']['parametersData']
print(parametersData)
