将str文本类型转换为dict

---for test---

1. 往文件写如内容：

    1 f = open("mall.txt",'w+',encoding='utf-8')
    2 goods = {
    3     '电子产品':[
    4         ['mac',7500,7],
    5         ['iphone7',5400,5],
    6         ['thunder',7600,3]
    7     ],
    8     '母婴用品':[
    9         ['帮宝适',45.9,50],
   10         ['美素佳儿',380,10]
   11     ],
   12     '摩托汽车':[
   13         ['特斯拉',820000,2],
   14         ['雷克萨斯Rx450',450000,5]
   15     ],
   16     '日常用品':[
   17         ['东北大米',38.5,20],
   18         ['上海青',3.6,47]
   19     ]
   20 }
   21 s = str(goods)
   22 f.write(s)
   23 f.close()

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