text: from selenium import webdriver
  from selenium.webdriver.remote.webelement import WebElement
  import time
  driver = webdriver.Chrome()
  driver.get("https://www.baidu.com")
  submitBtn = driver.find_element_by_id("su")
  print(type(submitBtn))
  print(submitBtn.get_attribute("value"))
  driver.save_screenshot("baidu.png")