python读取json文件并解析

# -*- coding: utf-8 -*-
import os
import json
import sys
reload(sys)
sys.setdefaultencoding('utf-8')

filelist=os.listdir('E:\log\files\')
for item in filelist:
    print item
newfile=open('E:\log\files2\target.txt','w')
os.chdir('E:\log\files')
for item in filelist:
    txt = open(item)
    json_txt=json.load(txt)
    tmp_str=','.join(map(lambda x:str(x),[json_txt['id'],json_txt['imageUrl'],json_txt['content']]))
    newfile.write(tmp_str)

newfile.close()

注：源文件必须是无bom utf8格式