python登录获取cookie，并使用到下一个接口

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import urllib.request, urllib.parse, urllib.error
import http.cookiejar

LOGIN_URL = 'http://test.login-api.xiaoman.cn/read/login'
values = {"account":"xxxx",
          "password":"xxxx",
          "code":"",
          "is_remember": "0",
          "system_id": "v5client",
          "need_safe": "0",
           "return_url": ""}
postdata = urllib.parse.urlencode(values).encode()
user_agent = r'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36'
headers = {'User-Agent': user_agent, 'Connection': 'keep-alive'}

cookie_filename = 'cookie.txt'
cookie = http.cookiejar.MozillaCookieJar(cookie_filename)
handler = urllib.request.HTTPCookieProcessor(cookie)
opener = urllib.request.build_opener(handler)

request = urllib.request.Request(LOGIN_URL, postdata, headers)
try:
    response = opener.open(request)
    page = response.read().decode()
    # print(page)
except urllib.error.URLError as e:
    print(e.code, ':', e.reason)

cookie.save(ignore_discard=True, ignore_expires=True)  # 保存cookie到cookie.txt中
print(cookie)
for item in cookie:
    print('Name = ' + item.name)
    print('Value = ' + item.value)

get_url = 'http://test.k.xiaoman.cn/api/mailSettingRead/userMailList'  # 利用cookie请求訪问还有一个网址
get_request = urllib.request.Request(get_url, headers=headers)
get_response = opener.open(get_request)
print(get_response.read().decode())