python3使用urllib获取set-cookies

#!/usr/bin/env python  
# encoding: utf-8  
import urllib.request
from collections import defaultdict
response=urllib.request.urlopen("https://twitter.com/login")
headerstr=response.getheaders()
d = defaultdict(list)
for k, v in headerstr:
    if "set-cookie" in k:
        d[k].append(v)
print(d.items())

#!/usr/bin/env python  
# encoding: utf-8  
import urllib.request
from collections import defaultdict
response=urllib.request.urlopen("https://twitter.com/login")
headerstr=response.getheader("set-cookie")
print(headerstr)