json转csv

import csv
import json
import re
import xlwt
class IO_rw(object):

    def __init__(self):
        #excel
        self.f = xlwt.Workbook(encoding='utf-8')
        self.sheet1 = self.f.add_sheet(u'sheet1', cell_overwrite_ok=True)

        #csv
        self.file_json = open("post_weibo_simple.json", "r+", encoding="utf-8")
        self.csvfile = open("test.csv", "w")
        self.writer = csv.writer(self.csvfile)
        b = ['id','name','location',"url","commentCount","pDate","fansCount","description","likeCount","shareCount","friendCount",
             "postCount"]
        self.writer.writerow(b)

    def process_item(self):

        dict_json = json.loads(self.file_json.read())

        for i_from in dict_json['data']:

            shareCount = i_from['shareCount']

            id = i_from['id']

            commentCount = i_from['commentCount']

            pDate = i_from['pDate']

            dict_i = i_from['from']

            friendCount = dict_i['friendCount']

            name = dict_i['name']

            likeCount = dict_i['likeCount']

            description = dict_i['description']

            url = dict_i['url']

            postCount = dict_i['postCount']

            fansCount = dict_i['fansCount']

            loca = dict_i['extend']

            location = loca['location']


            a = [id,name,location,url,commentCount,pDate,fansCount,description,likeCount,shareCount,friendCount,postCount]
            self.writer.writerow(a)


    def close_spider(self):
        self.file_json.close()
        self.csvFile.close()

if __name__ == '__main__':
    r = IO_rw()
    r.process_item()