場景
send_keys方法可以模拟一些組合鍵操作，比如ctrl+a等。另外有時候我們需要在測試時使用tab鍵将焦點轉移到下一個元素，這時候也需要send_keys。在某些更複雜的情況下，還會出現使用send_keys來模拟上下鍵來操作下拉清單的情況。
代碼
下面的代碼示範了如何将A多行文本框中的内容清空并複制到B文本框中。
send_keys.html
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<title>send keys</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" target="_blank" rel="external nofollow" rel="stylesheet" />
</head>
<body>
<h3>send keys</h3>
<div class="row-fluid">
<div class="span3">
<div class="well">
<label>A</label>
<textarea rows="10", cols="10" id="A">I think python is the best language.</textarea>
</div>
</div>
<div class="span3">
<div class="well">
<label>B</label>
<textarea rows="10", cols="10" id="B"></textarea>
</div>
</div>
</div>
</body>
<script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"></script>
</html>
send_keys.py
#!/usr/bin/env python
#-*- coding: utf-8 -*-
from selenium import webdriver
from time import sleep
import os
from selenium.webdriver.common.keys import Keys
dr = webdriver.Chrome()
file_path = 'file:///' + os.path.abspath('./html/send_keys.html')
dr.get(file_path)
dr.get(file_path)
# copy content of A
dr.find_element_by_id('A').send_keys((Keys.CONTROL, 'a'))
dr.find_element_by_id('A').send_keys((Keys.CONTROL, 'x'))
sleep(1)
# paste to B
dr.find_element_by_id('B').send_keys((Keys.CONTROL, 'v'))
sleep(1)
# # send keys to A
dr.find_element_by_id('A').send_keys('python', Keys.SPACE, 'is',Keys.SPACE, 'the', Keys.SPACE, 'best')
sleep(2)
dr.quit()
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