python编写selenium脚本，导入了SwitchTo但是在运行时报错

momochuhu

python编写selenium脚本，导入了SwitchTo但是在运行时报错：TypeError: 'SwitchTo' object is not callable

代码如下：
from selenium import selenium
from selenium import webdriver
import time
from selenium.webdriver.remote.webelement import WebElement
from selenium.webdriver.remote.webdriver import SwitchTo

......

driver.switch_to()
writeMail = driver.find_element_by_css_selector("li[id = 'xxxxx'][class = xxxxx']")
writeMail.click()
time.sleep(6)