selenium获取元素后用click()点击没有作用，用Keys.ENTER就可以成功

#coding = utf-8
from selenium import webdriver
from selenium.webdriver.common.keys import Keys


driver = webdriver.Firefox()
driver.get("http://www.baidu.com")

driver.find_element_by_xpath("//*[@id=‘gxszButton‘]/a[1]").send_keys(Keys.ENTER)    #键盘输入enter

# driver.find_element_by_xpath("//*[@id=‘gxszButton‘]/a[1]").click()   #用click()点__击

#提交,点击操作
driver.find_element_by_id("submit").click()
driver.find_element_by_xpath(‘//*[@id="btn_query"]‘).submit()
driver.find_element_by_id(‘btn_query‘).send_keys(Keys.ENTER)
driver.execute_script("var login=document.getElementById(‘btn_query‘);login.click();")