Python requests如何将第一个请求得到的 cookie 通过 POST 提交给第二个请求

#coding=utf-8

import requests
import json

url_login, url_test = "http://192.168.0.162/login","http://192.168.0.162/getinfo"
login_data = {'user': 'abc', 'psw': 123}

r = requests.post(url_login, data=login_data)
_cookies = r.cookies
test_data={'num':'abc123',"name":u"张三"}
r = requests.get(url_test, cookies=_cookies,data=test_data)

res_value=r.json()

d1 = json.dumps(res_value,sort_keys=True,ensure_ascii=False,indent=4)
print u'返回结果：'
print d1