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import urllib.parse,urllib.request,http.cookiejar
import re
def doLogin(url,postData):
    postData = urllib.parse.urlencode(postData)
    postData = postData.encode(encoding='UTF-8')
    header = {'User-Agent':'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)'}
    req = urllib.request.Request(
        url=url,
        data=postData,
        headers=header
    )
    return urllib.request.urlopen(req).read().decode('UTF8')
def setCookie():
    cookie = http.cookiejar.CookieJar()
    cookieProc = urllib.request.HTTPCookieProcessor(cookie)
    opener = urllib.request.build_opener(cookieProc)
    urllib.request.install_opener(opener)

url = "https://ssl.mail.163.com/entry/coremail/fcg/ntesdoor2?df=webmail163&from=web&funcid=loginone&iframe=1&language=-1&net=t&passtype=1&product=mail163&race=-2_-2_-2_db&style=-1&uid=xxxxxx"
strLoginInfo ={"username":"xxxxxx",
               "password":"123456abc"}

setCookie()
resp = doLogin(url,strLoginInfo)
m = re.search(r'href\s*=\s*"(.*)"',resp)
loginUrl = ""
if m:
    loginUrl = m.group(1)
logResp = urllib.request.urlopen(loginUrl)
html=logResp.read().decode('utf-8')
if not html.find("收件箱") == -1:
    print("登陆成功")