python爬虫模拟登录之验证码

#coding:utf8
import urllib2
import cookielib
url = '
#以上是动态生成验证码的网址
cj = cookielib.CookieJar()
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
urllib2.install_opener(opener)
response = urllib2.urlopen(url)
html = response.read()
f = open('/root/Desktop/test.jpg','wb')
#写入本地一个文本，ok
f.write(html)
f.close()