python selenium 获取对象输入的属性值

.get_attribute("value")

from selenium import webdriver
import time

driver=webdriver.Firefox()
driver.get("http://www.baidu.com")
driver.find_element_by_id("kw").send_keys("hello")
time.sleep(1)
var=driver.find_element_by_id("kw").get_attribute("value")
print(var)
driver.quit()