csv模块不支持unicode写入解决办法

csv模块不支持直接用unicode写入，没什么好方法，使用dict comprehension转换一下

# coding: utf-8 
import csv 
D ={'name':u'马克','pinyin':u'mǎkè'} 
f = open('out.csv','wb') 
f.write(u'\ufeff'.encode('utf8'))# BOM (optional...Excel needs it to open UTF-8 file properly) 
w = csv.DictWriter(f,sorted(D.keys())) 
w.writeheader() 
w.writerow({k:v.encode('utf8')for k,v in D.items()}) 
f.close()