selenium simple programming 01- 163 E-mail logout _ Modular

from selenium import webdriver
from time import sleep
class Login():
    def __init__(self,driver):
        self.driver=driver
    def login(self):
        self.driver.find_element_by_id('switchAccountLogin').click()
        sleep(3)
        If=self.driver.find_element_by_xpath('//iframe[starts-with(@id,"x-URS-iframe")]')
        self.driver.switch_to.frame(If)
        self.driver.find_element_by_name('email').send_keys('xueshanfeihu1992')
        self.driver.find_element_by_name('password').send_keys('hf13516458506')
        self.driver.find_element_by_id('dologin').click()
        sleep(3)
        self.driver.switch_to.default_content()
    def logout(self):
        self.driver.find_element_by_link_text('退出').click()

driver=webdriver.Firefox(executable_path='D:/Program Files/Mozilla Firefox/geckodriver')
driver.get('https://mail.163.com/')
driver.maximize_window()
sleep(6)
l=Login(driver)
l.login()
l.logout()
sleep(3)
driver.quit()
'''driver=webdriver.Firefox(executable_path='D:/Program Files/Mozilla Firefox/geckodriver')
driver.get('https://mail.163.com/')
driver.maximize_window()
sleep(6)
driver.find_element_by_id('switchAccountLogin').click()
sleep(3)
If=driver.find_element_by_xpath('//iframe[starts-with(@id,"x-URS-iframe")]')
driver.switch_to.frame(If)
driver.find_element_by_name('email').send_keys('xueshanfeihu1992')
driver.find_element_by_name('password').send_keys('hf13516458506')
driver.find_element_by_id('dologin').click()
sleep(3)
#一定要推出iframe，即使进入新的页面
driver.switch_to.default_content()
try:
    #driver.find_element_by_xpath('//a[text()="退出"]').click()
    driver.find_element_by_link_text('退出').click()
finally:
    sleep(4)
    driver.quit()'''