python报错信息type 'exceptions.AttributeError'是什么意思，,python报错Exce

python报错信息type 'exceptions.AttributeError'是什么意思，,python报错Exce

python
报错

Exception in thread Thread-1 (most likely raised during interpreter shutdown):Traceback (most recent call last):  File "/usr/lib/python2.6/threading.py", line 532, in __bootstrap_inner  File "/usr/lib/python2.6/threading.py", line 484, in run  File "dxcad.py", line 243, in threadget  File "dxcad.py", line 181, in gethtml  File "/usr/lib/python2.6/urllib2.py", line 126, in urlopen  File "/usr/lib/python2.6/urllib2.py", line 391, in open  File "/usr/lib/python2.6/urllib2.py", line 409, in _open  File "/usr/lib/python2.6/urllib2.py", line 369, in _call_chain  File "/usr/lib/python2.6/urllib2.py", line 1190, in http_open  File "/usr/lib/python2.6/urllib2.py", line 1164, in do_open<type 'exceptions.AttributeError'>: 'NoneType' object has no attribute 'error'

代码

def gethtml(url):    encoding_support = ContentEncodingProcessor    prodom=proxylist[random.randint(0,proxn)]    proxy_support = urllib2.ProxyHandler({'http':prodom})    opener = urllib2.build_opener(proxy_support,encoding_support,urllib2.HTTPHandler)    urllib2.install_opener(opener)    try:        bpanhtml = urllib2.urlopen(url,timeout = 2).read()    except Exception,e:        print e        return gethtml(url)    return bpanhtml

求教

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