怎么在python中使用selenium发送带附件的邮件

from selenium import webdriver
import unittest
import time

class VisitSogouByChrome(unittest.TestCase):

  def setUp(self):
    # 启动Chrome浏览器
    self.driver = webdriver.Chrome(executable_path = "e:\\chromedriver.exe")


  def test_sendEmail(self):
    # 访问163邮箱的首页
    self.driver.get("https://mail.163.com/")
    # 打印当前网页的网址
    self.driver.maximize_window()
    #点击密码登录
    self.pwd_link = self.driver.find_element_by_xpath("//a[text()='密码登录']")
    self.pwd_link.click()
    #找到登录框的iframe
    login_input_iframe = self.driver.find_element_by_xpath("//iframe[contains(@id,'x-URS-iframe')]")
    # 切换进登录框的iframe
    self.driver.switch_to.frame(login_input_iframe)

    self.user_name = self.driver.find_element_by_xpath("//input[@name='email']")
    self.pass_wd = self.driver.find_element_by_xpath("//input[@name = 'password']")
    self.login_button =self.driver.find_element_by_xpath("//a[@id ='dologin']")

    #清空用户名
    self.user_name.clear()
    self.user_name.send_keys("ff_gaofeng")
    self.pass_wd.send_keys("XXX")
    self.login_button.click()
    time.sleep(5)

    #点击“写信”button
    self.writer_button = self.driver.find_element_by_xpath("//span[text()='写 信']")
    self.writer_button.click()
    time.sleep(2)

    #输入收件人的邮箱
    self.addressee = self.driver.find_element_by_xpath("//input[contains(@aria-label,'收件人地址输入框')]")
    self.addressee.send_keys('ff_gaofeng@163.com')

    #输入邮件主题
    self.title = self.driver.find_element_by_xpath("//input[contains(@id,'subjectInput')]")
    self.title.send_keys('发给自己的一封邮件')

    #上传文件
    self.uppload_file_link = self.driver.find_element_by_xpath("//input[@type = 'file']")
    #self.uppload_file_link = self.driver.find_element_by_xpath("//a[text()='添加附件']")
    self.uppload_file_link.send_keys(r"D:\1.py")
    time.sleep(5)

    # 切换进入boby的iframe
    #boby_iframe = self.driver.find_element_by_xpath("//iframe[@class='APP-editor-iframe']")
    #self.driver.switch_to.frame(boby_iframe)
    self.driver.switch_to.frame(self.driver.find_element_by_xpath("//iframe[@class='APP-editor-iframe']"))

    # 输入邮件正文内容
    self.body = self.driver.find_element_by_xpath("html/body")
    self.body.send_keys("实现写邮件，上传附件的功能自动化用了。。。。。。。。")
    self.driver.switch_to.default_content()

    #点击“发送”按钮
    self.send_email = self.driver.find_element_by_xpath("//header//span[text()='发送']")
    self.send_email.click()



  def tearDown(self):
    # 退出IE浏览器
    self.driver.quit()

if __name__ == '__main__':
  unittest.main()