层级定位
场景：解决两个控件很多属性基本相同，需要具体定位其中一个
1.html文件，命名为level_locate.html
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<title>Level Locate</title>
<script type="text/javascript" async="" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<link href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css" rel="stylesheet" />
</head>
<body>
<h3>Level locate</h3>
<div class="span3">
<div class="well">
<div class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" href="#">Link1</a>
<ul class="dropdown-menu" role="menu" aria-labelledby="dLabel" id="dropdown1" >
<li><a tabindex="-1" href="#">Action</a></li>
<li><a tabindex="-1" href="#">Another action</a></li>
<li><a tabindex="-1" href="#">Something else here</a></li>
<li class="divider"></li>
<li><a tabindex="-1" href="#">Separated link</a></li>
</ul>
</div>
</div>
</div>
<div class="span3">
<div class="well">
<div class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" href="#">Link2</a>
<ul class="dropdown-menu" role="menu" aria-labelledby="dLabel" >
<li><a tabindex="-1" href="#">Action</a></li>
<li><a tabindex="-1" href="#">Another action</a></li>
<li><a tabindex="-1" href="#">Something else here</a></li>
<li class="divider"></li>
<li><a tabindex="-1" href="#">Separated link</a></li>
</ul>
</div>
</div>
</div>
</body>
<script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"></script>
</html>2.test.py文件
#层级定位，先定位父元素，后定位子孙元素
#level_locate.html需要和test_2文件在同一路径下
#-*-coding：utf-8
from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
import time
import os
dr = webdriver.Firefox()
file_path = 'file:///' + os.path.abspath('level_locate.html')
dr.get(file_path)
#点击link链接（弹出下拉列表）
dr.find_element_by_link_text('Link1').click()
#找到id为dropdown1的父元素
WebDriverWait(dr,10).until(lambda the_driver:the_driver.find_element_by_id('dropdown1').is_displayed())
#在父亲元件下找到link为Action的子元素
menu = dr.find_element_by_id('dropdown1').find_element_by_link_text('Action')
#鼠标定位到子元素上
webdriver.ActionChains(dr).move_to_element(menu).perform()
time.sleep(2)
dr.quit()