对于网站禁止访问需要模拟浏览器访问，用到User-Agent

from urllib import request
opener = request.build_opener()
opener.addheaders=[('User-Agent','Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1941.0 Safari/537.36')]
request.install_opener(opener)