爬虫解决验证码，用requests创建session会话对象

import requests

from urllib import request

import re

session=requests.session()

form={

'form_email':'',

'form_password':''

}

def login():

login_url='https://accounts.douban.com/login'

form = {

'form_email': '',

'form_password': ''

}

response=session.post(login_url,data=form)

response.encoding=response.apparent_encoding

html=response.text

if 'captcha_image' in html:

captcha_pat=re.compile(r'id="captcha_image" src="(.+?)"')

res=captcha_pat.search(html)

captcha=res.group(1)

request.urlretrieve(captcha,'douban.png'