当我抓取的字典是下面这些信息后

{

"description" : "购买方名称",

"key" : "vat_invoice_payer_name",

"positions" : [],

"value" : "广州有限公司"

}

,

{

"description" : "规格型号",

"key" : "vat_invoice_plate_specific",

"positions" : [],

"value" : "一个U盘"

},

{

"description" : "金额明细",

"key" : "vat_invoice_price_list",

"positions" : [],

"value" : "170.80"

}

我想输出   一个u盘，尝试过遍历字典，但是全部都遍历了，达不到需要的效果，规格型号的名字一直都在变动，如何判断抓取？