randdom_header= random.choice(Headers) 爬虫代码里面这一句编译报错老找不到原因那位大神帮我看下

Question

#-*-coding:utf-8-*-    import urllib2  import random  from wsgiref.headers import Headers  url="http://blog.csdn.net/qysh123/article/details/44564943"    my_headers=["Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36",  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36",  "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0"  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.75.14 (KHTML, like Gecko) Version/7.0.3 Safari/537.75.14",  "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)"        ]  def get_content(url,headers):   randdom_header= random.choice(Headers)  req=urllib2.Request(url)  req.add_header("User-Agent",randdom_header)  req.add_header("Host","blog.csdn.net")  req.add_header("Referer","http://blog.csdn.net/")  req.add_header("GET",url)   content=urllib2.urlopen(req).read()  return content    print get_content(url,my_headers)