selenium python 打开新的标签页

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
#phantomjs 需要改动下 
driver = webdriver.Firefox()
driver.get("http://login.taobao.com")
#windows 用Keys.CONTROL 如同ctrl+t
driver.find_element_by_tag_name('body').send_keys(Keys.COMMAND + 't') 
driver.get('http://mm.taobao.com/')
driver.find_element_by_tag_name('body').send_keys(Keys.COMMAND + 'w') 
driver.close()