url='https://jobs.51job.com/beijing/javakaifa/'
res=requests.get(url)
res.encoding='gbk'
print('res is:',res)

print(res.encoding)

print('res .text is:',res.text)

最终打印出来的res.text是这种格式，而不是XML格式，是什么原因？
html, body, div, span, p{
margin:0;
padding:0;
border:0;
outline:0;
font-size:100%;
vertical-align:baseline;
background:transparent;
}
body{
background: #fff;
}
.head{
position: relative;
height: 70px;
padding-left: 25px;
border-bottom: 1px solid #EBECEC;
}

	.content{
		width: 1000px;
		min-height: 500px;
		margin-top: 90px;
		margin-left: auto;
		margin-right: auto;
	}
	.left{
		width: 510px;
		height: 382px;
		float: left;
		background: url(https://g.alicdn.com/sd-base/static/1.0.10/image/nocapture/robot.png) no-