python+webdriver想登录淘宝，输入用户名密码点登录后，提示请输入验证码，然后怎么解决？

# -*- coding: utf-8 -*-
from selenium import webdriver

driver = webdriver.Chrome()
driver.implicitly_wait(30)
driver.get('https://login.taobao.com/member/login.jhtml')
driver.find_element_by_id("TPL_username_1").send_keys("myname")
time.sleep(1)
driver.find_element_by_id("TPL_password_1").send_keys("pwd")
time.sleep(1)
driver.find_element_by_id("J_SubmitStatic").click()
time.sleep(1)
error_text = driver.find_element_by_class_name('error').text
print error_text

我是新手，获取不到error，要怎么解决？