from selenium import webdriver
import time

driver=webdriver.Chrome()
driver.get("https://mail.qq.com/")
driver.maximize_window()

driver.find_element_by_xpath("//*[text()=\"QQ登录\"]")

driver.switch_to_frame("login_frame")
driver.find_element_by_xpath("//*[@id=\"u\"]").send_keys("50459685")
driver.find_element_by_xpath("(//*[text()=\"注册新帐号\"])[1]").click()

//***********利用数组下标切换窗口
handles=driver.window_handles
driver.switch_to_window(handles[-1])

driver.find_element_by_xpath("//*[@id='nickname']").send_keys("ruanheng")
driver.switch_to_window(handles[0])