求助:写一个爬p站图片的爬虫遇到小问题

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import urllib.request
import urllib.parse
import http.cookiejar
import random


email = input('输入邮箱：')
password=input('输入密码:')
url = 'https://accounts.pixiv.net/login?lang=zh&source=pc&view_type=page&ref=wwwtop_accounts_index'
cookie = http.cookiejar.CookieJar()
cjhdr = urllib.request.HTTPCookieProcessor(cookie)
agent_list = ['Mozilla/5.0 (Windows; U; Windows NT 5.2) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.2.149.27 Safari/525.13 '
               ,'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.12) Gecko/20080219 Firefox/2.0.0.12 Navigator/9.0.0.6'
              ,'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ;  QIHU 360EE)'
              ]
opener =urllib.request.build_opener(cjhdr)
urllib.request.install_opener(opener)


agent = random.choice(agent_list)
data = {}
data['password']=password
data['pixiv_id']=email
data['post_key']= '42ff0b9f520223dfbc9e6106ca4254ba'
data['ref']='wwwtop_accounts_index'
data['return_to'] = 'http%3A%2F%2Fwww.pixiv.net%2F'
data['source']='pc'

data = urllib.parse.urlencode(data).encode()

req = urllib.request.Request(url,data,origin_req_host='https://accounts.pixiv.net/api/login?lang=zh')
req.add_header('User-Agent',agent)


response = urllib.request.urlopen(req,data)
content = response.read()

python版本：python3

最近想写一个爬虫来爬p站的图片，然而途中遇到了很多的问题，一开始是正则表达式不会然后跑去学正则表达式，学完了之后再回去发现不行，看了好久才发现要登录，于是改用post来发送表单，然而现在又遇到了问题，这段代码执行之后就是urllib.error.HTTPError: HTTP Error 400: Bad Request
现在是真的不知道怎么办了，大佬们求助啊

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自顶....

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人工置顶....