可能是你沒有安裝urllib2模塊或者沒有引用吧。注意python3版本已經(jīng)沒有urllib2了

Python3

import?urllib.request


class?HtmlDownloader(object):
????def?download(self,?url):
????????if?url?is?None:
????????????return
????????response?=?urllib.request.urlopen(url)

????????if?response.getcode()?!=?200:
????????????return?None

????????return?response.read()

urllib2包導(dǎo)入了么？