webdriver until

#!author zhang
from selenium import webdriver
from time import sleep,ctime
driver = webdriver.Firefox()
driver.get("http://www.baidu.com")

def testxpath2(yuansu):
    for i in range(10):
        try:
            element = driver.find_element_by_xpath(yuansu)
            if element.is_displayed():
                return  driver.find_element_by_xpath(yuansu)
                break

        except:pass
        sleep(1)
    else:
        print("no yunaus")

testxpath2(".//*[@id='kw']").send_keys("iifffii")